Perhaps you should try some spelling variations:
thieu tinh » trieu tinh, chieu tinh, thien tinh
duong cong » dung cong, luong cong, duong trong
hoc thieu » toc thieu, hoc hien
trinh vat » trinh van, trinh luat, sinh vat
trinh va » trinh van, trinh ve, trinh vi
cong san » cong tac
san van » tan van, luan van, tran 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 thieu tinh - canh ((trinh va) or (trinh vat)) duong cong san van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu tinh - canh ((trinh va) OR (trinh vat)) duong cong san van ban*.