Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
dinh duc » minh duc, ninh duc, tinh duc
dua tren » dung tren
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cam tuc » cam xuc, cam tu, nam thuc
va dinh » van dinh, va kinh, va tinh
cuu tre » cua tre, cau tren, cau treo
va cam » va cham, va cac, va cao
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: doc sach ky nang xa hoi. hieu va cam tuc va dinh duc ((cuu tre) or (dua tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach ky nang xa hoi. hieu va cam tuc va dinh duc ((cuu tre) OR (dua tren)).
• Adding a wildcard symbol may retrieve word variants: doc sach ky nang xa hoi. hieu va cam tuc va dinh duc ((cuu tre) or (dua tren))*.