Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
tinh voi » trinh voi, tinh doi, binh voi
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » lang xa, nang ma, mang xa
nam tuc » nam thuc, nam truc, nam tu
va tinh » may tinh
cua tre » cuu tre, cua triet, dua tren
tuc va » thuc va, truc va, tuc xa
cua te » cua tu

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