Perhaps you should try some spelling variations:
thanh trung » thanh tung
tran thong » toan thong, tran hong, tran phong
tran trong » gian trong, quan trong, tran hong
hoc thiet » hoc thuyet, hoc hien, toc thieu
hoc thieu » toc thieu, hoc hien
cong tac » cong ty
quan cau » quang cao, toan cau, quan ha

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 thieu)) hach - thanh trung ((tran thong) or (tran trong)) cong tac quan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thiet) OR (hoc thieu)) hach - thanh trung ((tran thong) OR (tran trong)) cong tac quan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thiet) OR (hoc thieu)) hach - thanh trung ((tran thong) or (tran trong)) cong tac quan cau".
• Adding a wildcard symbol may retrieve word variants: ((hoc thiet) OR (hoc thieu)) hach - thanh trung ((tran thong) or (tran trong)) cong tac quan cau*.