Perhaps you should try some spelling variations:
va thanh » ban thanh, va tinh, le thanh
cau tren » cu tren, dau tren, ca tren
te sach » toc sach
cao hoi » cau hoi, co hoi, cao hoc
cuu tre » cua tre, cau treo
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
va nam » van nam, ha nam, va nay
nam tu » nam thu, nam thuc

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 nang cao hoi. lieu va nam tu ((va thanh) or (gia thanh)) hai ((cuu tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach v nang cao hoi. lieu va nam tu ((va thanh) OR (gia thanh)) hai ((cuu tre) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: te sach v nang cao hoi. lieu va nam tu ((va thanh) or (gia thanh)) hai ((cuu tre) or (cau tren))*.