Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thanh doi » thanh loi, thanh moi, thanh do
vu khach » vu khanh, vu khac, vay khach
cam thuc » am thuc, nam thuc, cam thu
va thanh » gia thanh, ban thanh, va tinh
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
nang xa » nang x, nang ma, mang xa
thuc va » thuc vat, thuc dan, thuc day
doi cua » dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao

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

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