Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
bat thanh » bac thanh, dat thanh, ba thanh
cham luc » cham soc, nhan luc, cham cuu
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
cua tre » cua te, cuu tre, cua triet
sac ky » sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sac ky) or (cac ky)) nang xa hoi. hieu ve cham luc ((bat thanh) OR (ban thanh)) dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sac ky) OR (cac ky)) nang xa hoi. hieu ve cham luc ((bat thanh) OR (ban thanh)) dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sac ky) or (cac ky)) nang xa hoi. hieu ve cham luc ((bat thanh) OR (ban thanh)) dai cua tre".
• Adding a wildcard symbol may retrieve word variants: thu ((sac ky) or (cac ky)) nang xa hoi. hieu ve cham luc ((bat thanh) OR (ban thanh)) dai cua tre*.