Perhaps you should try some spelling variations:
nang mai » nang ma, nang tai, lang mai
cam thuc » am thuc, nam thuc, cam thu
vat hanh » vat thanh, van hanh, va hanh
mai hoi » mai khoi, dai hoi, lai hoi
qua cam » qua cham, qua cac, qua ca
cua tre » cua te, cuu tre, cua triet
sach v » sach va, sach 2, sach vay
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: te ((sach v) or (sach y)) nang mai hoi. hieu qua cam thuc vat hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach v) OR (sach y)) nang mai hoi. hieu qua cam thuc vat hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: te ((sach v) or (sach y)) nang mai hoi. hieu qua cam thuc vat hanh vi cua tre*.