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 thu
thuc van » thuc vat, thuc dan, thuc va
van hanh » van thanh, ban hanh, van anh
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 le » hieu ve, hieu he, tieu le
hieu ly » hieu ky, lieu ly, dieu ly

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 le) or (hieu ly)) nam thuc van 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 le) OR (hieu ly)) nam thuc van hanh lai chau tre.
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (thuat san)) ky nang xa hoi. ((hieu le) or (hieu ly)) nam thuc van hanh lai chau tre*.