Perhaps you should try some spelling variations:
cham luc » cham soc, nhan luc, cham cuu
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
lang ha » long ha
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
luc va » duc va, tuc va, loc va
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y ((nang xa) or (lang ha)) hoi. hieu ve cham luc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((nang xa) OR (lang ha)) hoi. hieu ve cham luc va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach y ((nang xa) or (lang ha)) hoi. hieu ve cham luc va hanh vi cua tre*.