Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
va hanh » van hanh, va thanh, va danh
cam luc » cam xuc, cau luc
sach ty » sach tu, sach thu, xach tay
qua cam » qua cham, qua cac, qua ca
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
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: vu ((sach ty) or (sach y)) nang ma hoi. hieu qua cam luc ((va hanh) or (van thanh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu ((sach ty) OR (sach y)) nang ma hoi. hieu qua cam luc ((va hanh) OR (van thanh)) vi cua tre.
• Adding a wildcard symbol may retrieve word variants: vu ((sach ty) or (sach y)) nang ma hoi. hieu qua cam luc ((va hanh) or (van thanh)) vi cua tre*.