Perhaps you should try some spelling variations:
thanh trung » thanh tung
nhung cong » dung cong, thong cong, hang cong
hoc nhieu » hoc nhiet, hop nhieu, hoc nghien
hoc thieu » toc thieu, hoc hien
trung vap » trung cap, trung va, trung van
dang cong » dung cong
tan van » tran van, tang van, luan van

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc nhieu) OR (hoc thieu)) tang - thanh trung vap ((nhung cong) or (dang cong)) tan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc nhieu) OR (hoc thieu)) tang - thanh trung vap ((nhung cong) OR (dang cong)) tan van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc nhieu) OR (hoc thieu)) tang - thanh trung vap ((nhung cong) or (dang cong)) tan van ban".
• Adding a wildcard symbol may retrieve word variants: ((hoc nhieu) OR (hoc thieu)) tang - thanh trung vap ((nhung cong) or (dang cong)) tan van ban*.