Perhaps you should try some spelling variations:
thieu tinh » trieu tinh, chieu tinh, thien tinh
thanh chau » thanh cha, thanh cham, thanh chu
hoc thieu » toc thieu, hoc hien
dung cong » dung trong
trang va » hang va
tran van » luan van
cong san » cong tac
phan cau » phan dau, phan cac, phan tu

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 tinh - canh ((trang va) OR (tran van)) dung cong san ((thanh chau) OR (phan cau))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu tinh - canh ((trang va) OR (tran van)) dung cong san ((thanh chau) or (phan cau))~".
• Adding a wildcard symbol may retrieve word variants: hoc thieu tinh - canh ((trang va) OR (tran van)) dung cong san ((thanh chau) or (phan cau))*.