Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
thuc van » thuc vat, thuc dan, thuc va
sach thu » sach thue, sach thieu, sach tham
tu sach » thu sach, su sach, te sach
vai cua » dai cua, hai cua, lai cua
xuc ban » duc ban, cuc ban, quoc ban
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
ve cam » ve cham, ve cac, va cam

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

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