Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
nang dau » hang dau, xang dau, nang du
hieu va » lieu va, hieu qua
vai cuu » vai cua
tuc van » thuc van, truc van, tuc va
cam tuc » cam xuc, cam tu, nam thuc
sach ty » sach thu, xach tay, sach hay
dau hoi » cau hoi, dai hoi, dan hoi
sach tu » sach thu, cach tu, sach uu
cuu tre » cua tre, cau tren, cau treo
va cam » va cham, va cac, va cao

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 ty) or (sach tu))) or (sach y)) nang dau hoi. hieu va cam tuc van hanh vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((((sach ty) OR (sach tu))) OR (sach y)) nang dau hoi. hieu va cam tuc van hanh vai cuu tre.
• Adding a wildcard symbol may retrieve word variants: su ((((sach ty) or (sach tu))) or (sach y)) nang dau hoi. hieu va cam tuc van hanh vai cuu tre*.