Perhaps you should try some spelling variations:
thieu tach » thien hach, chiet tach, chieu sach
nhung cong » dung cong, thong cong, hang cong
hoc thieu » toc thieu, hoc hien
trinh van » trinh han, trinh quan, trinh toan
trinh va » trinh vat, trinh ve, trinh vi
tran van » luan van
tan van » tang van, luan van, dang van

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 - canh ((trinh va) OR (trinh van)) nhung cong ((tan van) OR (tran van)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu tach - canh ((trinh va) or (trinh van)) nhung cong ((tan van) OR (tran van)) cau~".
• Adding a wildcard symbol may retrieve word variants: hoc thieu tach - canh ((trinh va) or (trinh van)) nhung cong ((tan van) OR (tran van)) cau*.