Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
hoc sach » hoc sinh, hoc cac, hoc anh
va thanh » gia thanh, ban thanh, va tinh
va triet » va thiet, va trien, ve triet
ty nang » ty xang, ty hang, ly nang
hieu vi » hieu voi, hieu va, hieu ve
va hanh » van hanh, va danh, ban hanh
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: hoc sach ((ty nang) or (ky nang)) xa hoi. hieu vi pham thuc ((va hanh) OR (va thanh)) tai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ((ty nang) OR (ky nang)) xa hoi. hieu vi pham thuc ((va hanh) OR (va thanh)) tai va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ((ty nang) or (ky nang)) xa hoi. hieu vi pham thuc ((va hanh) OR (va thanh)) tai va triet".
• Adding a wildcard symbol may retrieve word variants: hoc sach ((ty nang) or (ky nang)) xa hoi. hieu vi pham thuc ((va hanh) OR (va thanh)) tai va triet*.