Perhaps you should try some spelling variations:
cac thuc » cach thuc, cac thu, can thuc
thai cua » than cua, tai cuc, tri cua
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua
can ky » van ky, dan ky, tan ky
ban ky » van ky, dan ky
ve cac » va cac, vien cac
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((can ky) or (ban ky)) nang x hoi. hieu ve cac thuc va hanh ((vai cua) or (thai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((can ky) OR (ban ky)) nang x hoi. hieu ve cac thuc va hanh ((vai cua) OR (thai cua)) tre.
• Adding a wildcard symbol may retrieve word variants: tu ((can ky) or (ban ky)) nang x hoi. hieu ve cac thuc va hanh ((vai cua) or (thai cua)) tre*.