Perhaps you should try some spelling variations:
pham tinh » pham minh, pham dinh, pham vinh
cau tren » cu tren, dau tren, ca tren
hieu van » hieu va, thien van, lieu va
nang xa » lang xa, nang ma, mang xa
sach ty » sach y, sach tu, sach thu
tinh va » tich va, trinh van, trinh vat
cua tre » cua te, cuu tre, cua triet
tu sach » thu sach, su sach, te sach
van am » van nam, van lam, van dam
thuc » thu

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 ((nang xa) or (nang x)) hoi. hieu van am thuc pham tinh va ((cua tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((nang xa) OR (nang x)) hoi. hieu van am thuc pham tinh va ((cua tre) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((nang xa) or (nang x)) hoi. hieu van am thuc pham tinh va ((cua tre) or (cau tren))*.