Perhaps you should try some spelling variations:
cham xuc » chat xuc, cham soc, pham duc
so sach » so sanh, bo sach, co sach
hanh ve » hanh vi, hanh va, hanh kem
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
cac tre » cac tro, cac tru, cac trieu
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach y ((nang ma) or (nang x)) hoi. hieu ve ((cham xuc) or (cam xuc)) va hanh ve cac tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y ((nang ma) OR (nang x)) hoi. hieu ve ((cham xuc) OR (cam xuc)) va hanh ve cac tre.
• Adding a wildcard symbol may retrieve word variants: so sach y ((nang ma) or (nang x)) hoi. hieu ve ((cham xuc) or (cam xuc)) va hanh ve cac tre*.