Perhaps you should try some spelling variations:
sach tien » sach tren, sach thieu
tien nang » thien nang, trien nang, tin nang
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
thuc may » thuc day, truc may, phuc may
te sach » toc sach
nang xa » nang x, lang xa, nang ma
tinh va » tich va, trinh van, trinh vat
cuu tre » cua tre, cau tren, cau treo
tu tren » tu truyen, tu tieng, tu trong

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