Perhaps you should try some spelling variations:
thanh tay » thanh tai, thanh toan, thanh thuy
hoc phien » hoc hien, thuoc phien, hoc nghien
phien nam » hien nay, phien ban, mien nam
hoc viet » hoc hien
canh may » hanh may, mang may, anh mau
hoc vien » hoc hien, hoc tieng, hoc vi
canh tay » anh ta, ban tay
canh day » canh dan, lanh dao, can dai
canh tac » canh giac, anh ta, sang tac
cong tac » cong ty
vien nam » vien dai, van nam, hien nay
may va » may vi
tay va » tay ha, hay va, tay ma
va hoc » van hoc

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( thanh tay va hoc viet nam ) or ((((((( canh may va hoc vien nam ) or ( canh tay va hoc vien nam ))) or ( canh day va hoc vien nam ))) or ( ((canh tac) OR (cong tac)) va hoc phien nam ))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thanh tay va hoc viet nam ) OR ((((((( canh may va hoc vien nam ) OR ( canh tay va hoc vien nam ))) OR ( canh day va hoc vien nam ))) OR ( ((canh tac) OR (cong tac)) va hoc phien nam )))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( thanh tay va hoc viet nam ) or ((((((( canh may va hoc vien nam ) or ( canh tay va hoc vien nam ))) or ( canh day va hoc vien nam ))) or ( ((canh tac) OR (cong tac)) va hoc phien nam ))))".
• Adding a wildcard symbol may retrieve word variants: (( thanh tay va hoc viet nam ) or ((((((( canh may va hoc vien nam ) or ( canh tay va hoc vien nam ))) or ( canh day va hoc vien nam ))) or ( ((canh tac) OR (cong tac)) va hoc phien nam ))))*.