Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
van hanh » van thanh, ban hanh, van anh
thuc van » thuc vat, thuc dan, thuc va
cam thuc » am thuc, nam thuc, cam thu
so sach » so sanh, bo sach, co sach
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
vi cua » vai cua, di cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sach) or (thuat sach)) ky ((nang xa) or (lang xa)) hoi. hieu va cam thuc van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (thuat sach)) ky ((nang xa) OR (lang xa)) hoi. hieu va cam thuc van hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (thuat sach)) ky ((nang xa) or (lang xa)) hoi. hieu va cam thuc van hanh vi cua tre*.