Perhaps you should try some spelling variations:
thanh vien » nhan vien, thanh van
cac thuc » cach thuc, cac thu, can thuc
thanh ve » hanh ve, thanh va, thanh van
thuc va » thuc vat, thuc dan, thuc day
sach ky » sac ky, sach ty, sach kem
qua cac » cua cac
nang xa » nang x, lang xa, nang ma
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: so ((sach ky) OR (sach y)) nang xa hoi. hieu qua cac thuc va ((thanh ve) or (thanh vien)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so ((sach ky) OR (sach y)) nang xa hoi. hieu qua cac thuc va ((thanh ve) OR (thanh vien)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so ((sach ky) OR (sach y)) nang xa hoi. hieu qua cac thuc va ((thanh ve) or (thanh vien)) cua tre".
• Adding a wildcard symbol may retrieve word variants: so ((sach ky) OR (sach y)) nang xa hoi. hieu qua cac thuc va ((thanh ve) or (thanh vien)) cua tre*.