Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
dinh tai » dinh toai, dinh tri, dinh thi
tu sach » thu sach, su sach, te sach
thuc va » thuc vat, thuc dan, thuc day
cuu tre » cua tre, cau tren, cau treo
duc tre » duoc tren, duc tien
van lam » van nam
nang xa » nang x, lang xa, nang ma
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang

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 v nang xa hoi. hieu van lam ((tuc xa) or (thuc va)) dinh tai ((cuu tre) or (duc tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach v nang xa hoi. hieu van lam ((tuc xa) OR (thuc va)) dinh tai ((cuu tre) OR (duc tre)).
• Adding a wildcard symbol may retrieve word variants: tu sach v nang xa hoi. hieu van lam ((tuc xa) or (thuc va)) dinh tai ((cuu tre) or (duc tre))*.