Perhaps you should try some spelling variations:
sach khien » sach khuyen, sach thieu, sach tien
khien bang » phien ban, khien dong
cau tren » cu tren, dau tren, ca tren
dua tren » dung tren
tinh vi » trinh vi, tinh voi, tinh va
va tinh » may tinh
su sach » so sach, vu sach
van cam » van lam, van cau, van dam
bang xa » lang xa, bang va, mang xa
xuc va » duc va, tuc va, luc 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 khien bang xa hoi. hieu ((van cam) OR (van nam)) xuc va tinh vi ((dua tren) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach khien bang xa hoi. hieu ((van cam) OR (van nam)) xuc va tinh vi ((dua tren) OR (cau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach khien bang xa hoi. hieu ((van cam) OR (van nam)) xuc va tinh vi ((dua tren) or (cau tren))".
• Adding a wildcard symbol may retrieve word variants: su sach khien bang xa hoi. hieu ((van cam) OR (van nam)) xuc va tinh vi ((dua tren) or (cau tren))*.