Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
nam thuc » nam thuoc, am thuc, nam tu
hanh tai » thanh tai, hang tai, han tai
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
cuc tre » duc tre, cuu tre, cuc thue
cua tre » cua te, cuu tre, cua triet

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