Perhaps you should try some spelling variations:
ban thanh » ban hang
cao thuc » cao thuoc, bao thuc, can thuc
dong cua » dung cua, cong cua, huong cua
ban hanh » ban hang
xach tay » canh tay
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
sach tu » sach thu, cach tu, sach ty
va cao » va cac, va co, va dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((xach tay) or (sach tu)) nang xa hoi. hieu va cao thuc ((ban thanh) OR (ban hanh)) dong cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((xach tay) OR (sach tu)) nang xa hoi. hieu va cao thuc ((ban thanh) OR (ban hanh)) dong cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((xach tay) or (sach tu)) nang xa hoi. hieu va cao thuc ((ban thanh) OR (ban hanh)) dong cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((xach tay) or (sach tu)) nang xa hoi. hieu va cao thuc ((ban thanh) OR (ban hanh)) dong cua tre*.