Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
ve triet » va trien, su triet
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cam duc » cam xuc, cao duc, pham duc
va hang » van hang, va lang, va hanh
sach ky » sac ky, sach y, sach ty
va nang » van nang, da nang, cam nang
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao

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 xa hoi. hieu va cam duc ((va hang) OR (va nang)) di ((cua tre) or (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang xa hoi. hieu va cam duc ((va hang) OR (va nang)) di ((cua tre) OR (ve triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang xa hoi. hieu va cam duc ((va hang) OR (va nang)) di ((cua tre) or (ve triet))".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang xa hoi. hieu va cam duc ((va hang) OR (va nang)) di ((cua tre) or (ve triet))*.