Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
cham thuc » nham thuc, pham thuc, tham thuc
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
thuc van » thuc vat, thuc dan, thuc va
hieu ve » hieu va, hieu van
vai cua » dai cua, hai cua, lai cua
ve cham » va cham, ve chat, vu cham
su sach » so sach, vu sach
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
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: ((su sach) or (thuat sach)) ky ((nang xa) or (lang xa)) hoi. hieu ve cham thuc van hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (thuat sach)) ky ((nang xa) OR (lang xa)) hoi. hieu ve cham thuc van hanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (thuat sach)) ky ((nang xa) or (lang xa)) hoi. hieu ve cham thuc van hanh vai cua tre*.