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
lam thuc » lam thuoc, am thuc, nam thuc
cua tre » cua te, cuu tre, cua triet
tinh va » tich va, trinh van, trinh vat
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » lang xa, nang ma, mang xa
van lam » van nam

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