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

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) OR (sach y)) nang cao hoi. hieu vi pham thuc va ((hanh van) or (thanh van)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((sach ky) OR (sach y)) nang cao hoi. hieu vi pham thuc va ((hanh van) OR (thanh van)) su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((sach ky) OR (sach y)) nang cao hoi. hieu vi pham thuc va ((hanh van) or (thanh van)) su triet".
• Adding a wildcard symbol may retrieve word variants: doc ((sach ky) OR (sach y)) nang cao hoi. hieu vi pham thuc va ((hanh van) or (thanh van)) su triet*.