Perhaps you should try some spelling variations:
thieu tach » thien hach, chiet tach, chieu sach
hoc thieu » toc thieu, hoc hien
trang van » trang va, trong van, tang van
dung cong » dung trong
tan nhanh » tai nhanh, tan nhan, tan thanh
tram van » tam van, tranh van, pham van
tran van » luan van
cong tan » cong tac, cong san, cong thanh
nhanh ha » thanh hoa, thanh hai, khanh hoa

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu tach - hanh ((((tram van) OR (tran van))) OR (trang van)) dung cong tan nhanh ha~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu tach - hanh ((((tram van) OR (tran van))) or (trang van)) dung cong tan nhanh ha~".
• Adding a wildcard symbol may retrieve word variants: hoc thieu tach - hanh ((((tram van) OR (tran van))) or (trang van)) dung cong tan nhanh ha*.