Perhaps you should try some spelling variations:
te sach » toc sach
cach tu » cach thuc
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
nang ra » nang ma, lang ra, nang ro
nang co » nang cao, nang doc, nang noi
cua tre » cua te, cuu tre, cua triet
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va
vi cua » vai cua, di cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty ((nang co) OR (nang ra)) hoi. hieu ve ((cach tu) OR (cac du)) va dan vi cua tre~.
• Adding a wildcard symbol may retrieve word variants: te sach ty ((nang co) or (nang ra)) hoi. hieu ve ((cach tu) or (cac du)) va dan vi cua tre*.