Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
nang xa » nang x, lang xa, nang ma
qua cac » cua cac
cac bao » cach bao, cac bai, cac ban
va hanh » van hanh, va thanh, va danh
cua tre » cuu tre, cua triet, dua tren
xac ky » cac ky, sac ky
bac ky » cac ky, ban ky, sac ky
bao va » bao ve, tao va, ban va
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((xac ky) or (bac ky)) nang xa hoi. hieu qua cac bao va hanh dai ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((xac ky) OR (bac ky)) nang xa hoi. hieu qua cac bao va hanh dai ((cua tre) OR (cua te))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((xac ky) or (bac ky)) nang xa hoi. hieu qua cac bao va hanh dai ((cua tre) OR (cua te))*".