Perhaps you should try some spelling variations:
sach thien » sach thieu, cach thien, sach tren
sach tien » sach tren, sach thieu
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cua triet, dua tren
tinh vi » trinh vi, tinh voi, tinh va
va tinh » may tinh
van lam » van nam
lam luc » lao luc, lam duoc
bang xa » lang xa, bang va, mang xa
cuu tre » cau tren, cau treo
luc va » duc va, tuc va, loc 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 thien) or (sach tien)) bang xa hoi. hieu van lam luc va tinh vi ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach thien) OR (sach tien)) bang xa hoi. hieu van lam luc va tinh vi ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: su ((sach thien) or (sach tien)) bang xa hoi. hieu van lam luc va tinh vi ((cua tre) or (cuu tre))*.