Perhaps you should try some spelling variations:
hoc thuyet » hoc chuyen
hoc thiet » hoc thieu, hoc hien, toc thieu
tao thiet » tai thiet, tay thiet, toan thiet
hanh tran » hanh trang, thanh tran, hanh tram
dung cong » dung trong
tan tranh » tan tran, can tranh, lan tranh
tranh ban » trinh ban, tranh hang, tranh luan
tran xay » tra xay, tran day, trinh xay
cong tan » cong tac, cong san, cong thanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((((hoc thiet) OR (hoc thuyet))) or (tao thiet)) tach - hanh tran xay dung cong tan tranh ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((hoc thiet) OR (hoc thuyet))) OR (tao thiet)) tach - hanh tran xay dung cong tan tranh ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((hoc thiet) OR (hoc thuyet))) or (tao thiet)) tach - hanh tran xay dung cong tan tranh ban".
• Adding a wildcard symbol may retrieve word variants: ((((hoc thiet) OR (hoc thuyet))) or (tao thiet)) tach - hanh tran xay dung cong tan tranh ban*.