Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
tinh bai » tinh bac, tinh hai, hinh bai
cham luc » cham soc, nhan luc, cham cuu
bai cua » ban cua, dai cua, bai ca
va tinh » may tinh
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach ty, sach kem
hieu ve » hieu va
nang xa » nang x, lang xa, nang ma
luc va » duc va, tuc va, loc va

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

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