Perhaps you should try some spelling variations:
sach tien » sach tren, sach thieu
tien nang » thien nang, trien nang, tin nang
trinh van » trinh han, trinh quan, trinh toan
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
cuu tre » cua tre, cau tren, cau treo
tinh va » tich va, trinh vat, tinh gia
van cau » van dau, van hau, van chat
nang xa » nang x, lang xa, nang ma
cu tren » tu tren, dua tren
cau tu » dau tu, cau truc

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach tien nang xa hoi. hieu van cau tu va ((tinh va) or (trinh van)) ((cuu tre) or (cu tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach tien nang xa hoi. hieu van cau tu va ((tinh va) OR (trinh van)) ((cuu tre) OR (cu tren)).
• Adding a wildcard symbol may retrieve word variants: toc sach tien nang xa hoi. hieu van cau tu va ((tinh va) or (trinh van)) ((cuu tre) or (cu tren))*.