Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
cham luc » cham soc, nhan luc, cham cuu
tinh dai » trinh dai, tinh da, tinh hai
hoc sac » hoc sach, hoc cac, hoc mac
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
luc may » truc may, phuc may
cua tre » cua te, cuu tre, cua triet
sac ky » cac 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: hoc sac ky nang xa hoi. ((hieu van) or (hieu va)) cham luc may tinh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sac ky nang xa hoi. ((hieu van) OR (hieu va)) cham luc may tinh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: hoc sac ky nang xa hoi. ((hieu van) or (hieu va)) cham luc may tinh dai cua tre*.