Perhaps you should try some spelling variations:
sach tien » sach tren, sach thieu
tien bang » thien bang, mien bang, tien lang
hieu van » hieu va, thien van, lieu va
dua tren » dung tren
su sach » so sach, vu sach
bang xa » lang xa, bang va, mang xa
van cam » van nam, van lam, van cau
tinh vi » trinh vi, tinh voi, tinh va
cuu tre » cua tre, cau tren, cau treo
xuc va » tuc va, luc va, xac va

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach tien bang xa hoi. hieu van cam ((xuc va) OR (duc va)) tinh vi ((dua tren) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach tien bang xa hoi. hieu van cam ((xuc va) OR (duc va)) tinh vi ((dua tren) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach tien bang xa hoi. hieu van cam ((xuc va) OR (duc va)) tinh vi ((dua tren) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: su sach tien bang xa hoi. hieu van cam ((xuc va) OR (duc va)) tinh vi ((dua tren) or (cuu tre))*.