Perhaps you should try some spelling variations:
hien tinh » khien tinh, thien tinh, bien tinh
lang cong » dang cong, bang cong, hang cong
tranh va » tranh van, trinh va, thanh va
trang va » tran van, hang va
cong san » cong tac
phan cau » phan dau, phan tu, phan lap
phan cac » nhan cach, phan dau, phan lap

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

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