Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
dua tren » dung tren
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
hieu va » lieu va, hieu qua
cam luc » cam xuc
sach ky » sac ky, sach y, sach ty
cau luc » cau truc, cau phuc
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau tren, 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 tang xa hoi. hieu va ((cam luc) or (cau luc)) va hanh vi ((cuu tre) or (dua tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky tang xa hoi. hieu va ((cam luc) OR (cau luc)) va hanh vi ((cuu tre) OR (dua tren)).
• Adding a wildcard symbol may retrieve word variants: thu sach ky tang xa hoi. hieu va ((cam luc) or (cau luc)) va hanh vi ((cuu tre) or (dua tren))*.