Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
kieu tinh » lieu tinh, trieu tinh, diep tinh
trang va » hang va
tran van » luan van
cong san » cong tac
phan cau » phan dau, phan cac, phan lap
ho kieu » ho lieu, so kieu, thi kieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho kieu tinh - canh ((trang va) or (tran van)) nhung cong san ((phan cau) or (phan tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho kieu tinh - canh ((trang va) OR (tran van)) nhung cong san ((phan cau) OR (phan tu)).
• Adding a wildcard symbol may retrieve word variants: ho kieu tinh - canh ((trang va) or (tran van)) nhung cong san ((phan cau) or (phan tu))*.