Perhaps you should try some spelling variations:
cong thanh » dong thanh, cong trinh, cong tan
tranh van » tran van, thanh van, tranh ban
trinh van » trinh han, trinh quan, trinh toan
chi sach » chinh sach, chieu sach, co sach
cong san » cong tac
phan lap » phan dau
doi chi » doi khi

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chi sach - canh ((tranh van) or (trinh van)) nhung ((cong san) or (cong thanh)) phan lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chi sach - canh ((tranh van) OR (trinh van)) nhung ((cong san) OR (cong thanh)) phan lap.
• Adding a wildcard symbol may retrieve word variants: doi chi sach - canh ((tranh van) or (trinh van)) nhung ((cong san) or (cong thanh)) phan lap*.