Perhaps you should try some spelling variations:
chat truc » cau truc, chat xuc
cau treo » cau theo, cau tren, cau triet
hieu cac » hieu luc, hieu va, hieu van
danh dai » danh dau, danh di, danh sai
hieu cao » chieu cao, hieu ca, kieu cao
sach ky » sac ky, sach y, sach ty
truc va » thuc va, thuc vat, trung va
va danh » va dinh, va dan, va hanh
nang ma » tang ma, sang ma, nang cao
cua tre » cua te, cuu tre, cua triet
tu sach » thu sach, su sach, te sach
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang ma hoi. ((hieu cao) OR (hieu cac)) chat truc va danh dai ((cua tre) or (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ma hoi. ((hieu cao) OR (hieu cac)) chat truc va danh dai ((cua tre) OR (cau treo)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ma hoi. ((hieu cao) OR (hieu cac)) chat truc va danh dai ((cua tre) or (cau treo))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ma hoi. ((hieu cao) OR (hieu cac)) chat truc va danh dai ((cua tre) or (cau treo))*.