Perhaps you should try some spelling variations:
tuan vai » tuan tai, trang vai, tuan khai
vu cham » va cham, vu kham, tu cham
vai cua » dai cua, hai cua, lai cua
sach ty » sach tu, sach thu, xach tay
hieu vu » hieu va, hieu ve, hieu su
cao hoi » cau hoi, co hoi, cao hoc
cua tre » cua te, cuu tre, cua triet
co dan » co ban, ca dan, cao dang
oc van » hoc van, luoc van, quoc van

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 ty) or (sach y)) nang cao hoi. hieu vu cham ((co dan) or (oc van)) tuan vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach y)) nang cao hoi. hieu vu cham ((co dan) OR (oc van)) tuan vai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach y)) nang cao hoi. hieu vu cham ((co dan) or (oc van)) tuan vai cua tre*.