Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
thanh van » thanh san, thanh toan, thanh phan
doc sach » hoc sach, toc sach, nuoc sach
hanh van » khanh van, hanh va, hanh san
su triet » su viet, su tien, ve triet
sach ky » sac ky, sach y, sach ty
cao hoi » cau hoi, co hoi, cao hoc
hieu vi » hieu voi, hieu va, hieu ve

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc sach ky nang cao hoi. hieu vi pham thuc vat ((hanh van) or (thanh van)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach ky nang cao hoi. hieu vi pham thuc vat ((hanh van) OR (thanh van)) su triet.
• Adding a wildcard symbol may retrieve word variants: doc sach ky nang cao hoi. hieu vi pham thuc vat ((hanh van) or (thanh van)) su triet*.