Perhaps you should try some spelling variations:
cham cuu » cap cuu, chat cua
cham luc » cham soc, nhan luc, chat lua
su sach » so sach, vu sach
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
lang ha » long ha
cua tre » cua te, cuu tre, cua triet
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 ma) or (lang ha)) hoi. hieu ve ((cham luc) or (cham cuu)) va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((nang ma) OR (lang ha)) hoi. hieu ve ((cham luc) OR (cham cuu)) va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach y ((nang ma) or (lang ha)) hoi. hieu ve ((cham luc) or (cham cuu)) va hanh vi cua tre*.