Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cau tren » cu tren, dau tren, ca tren
sach ky » sac ky, sach y, sach ty
cao hoi » cau hoi, co hoi, cao hoc
hieu va » lieu va, hieu qua
cac xuc » cac nuoc, chat xuc, cac cuoc
va danh » va dinh, va dan, va hanh
cuu tre » cua tre, cau treo

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

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