Perhaps you should try some spelling variations:
chat truc » cau truc, chat xuc
va triet » va thiet, va trien, ve triet
danh dai » danh dau, danh di, danh sai
hieu cac » hieu va, hieu van, vien cac
hieu luc » hieu luat, hieu qua
va danh » va dinh, va dan, va hanh
truc va » thuc va, thuc vat, trung va
tu sach » thu sach, su sach, te sach
hieu ca » hieu cua, hieu va, hieu xa
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
dai va » mai va

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. ((((hieu cac) OR (hieu luc))) OR (hieu ca)) chat truc va danh dai va triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. ((((hieu cac) OR (hieu luc))) or (hieu ca)) chat truc va danh dai va triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. ((((hieu cac) OR (hieu luc))) or (hieu ca)) chat truc va danh dai va triet*.