Perhaps you should try some spelling variations:
hanh kiem » khanh kiem, hanh kem, anh kiem
lang van » dang van, tang van, hoang van
phan duc » pham duc, phan tu, phan dau
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
ve phan » va phan, ke phan, ve phat
va hanh » van hanh, va thanh, va danh
kiem su » kiem thu, kiem sat, kiet suc

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y ((nang x) or (lang van)) hoi. hieu ve phan duc va hanh kiem su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((nang x) OR (lang van)) hoi. hieu ve phan duc va hanh kiem su triet.
• Adding a wildcard symbol may retrieve word variants: tu sach y ((nang x) or (lang van)) hoi. hieu ve phan duc va hanh kiem su triet*.