Perhaps you should try some spelling variations:
thuat san » thuat toan, thuat song, thuat lanh
thu sach » tu sach, thuat sach, thuoc sach
nam thuc » nam thuoc, am thuc, nam tu
hanh lai » hanh lam, hanh tai, thanh lap
chau tre » chay tren, chau tho, cho tre
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh

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