Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
doc sach » hoc sach, toc sach, nuoc sach
hanh tai » thanh tai, hang tai, han tai
va triet » va thiet, va trien, ve triet
ty nang » ty xang, ty hang, ly nang
hieu vi » hieu voi, hieu va, hieu ve
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
tai va » thai va, mai va, tri va

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 ((ty nang) or (ky nang)) xa hoi. hieu vi pham thuc va hanh tai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach ((ty nang) OR (ky nang)) xa hoi. hieu vi pham thuc va hanh tai va triet.
• Adding a wildcard symbol may retrieve word variants: doc sach ((ty nang) or (ky nang)) xa hoi. hieu vi pham thuc va hanh tai va triet*.