Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hieu van » hieu va, thien van, lieu va
cau tren » cu tren, dau tren, ca tren
hieu ve » hieu va
nang xa » nang x, lang xa, nang ma
sach ky » sac ky, sach y, sach ty
cam tuc » cam xuc, cam tu, nam thuc
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau treo
tuc va » thuc va, truc va, tuc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach ky nang xa hoi. ((hieu ve) or (hieu van)) cam tuc va hanh vi ((cuu tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ky nang xa hoi. ((hieu ve) OR (hieu van)) cam tuc va hanh vi ((cuu tre) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: thuoc sach ky nang xa hoi. ((hieu ve) or (hieu van)) cam tuc va hanh vi ((cuu tre) or (cau tren))*.