Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
dua tren » dung tren
sach thu » sach thue, sach thieu, sach tham
cau tren » cu tren, dau tren, ca tren
va thanh » gia thanh, va tinh, le thanh
thu nang » thi nang, thu hang, thu bang
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
te sach » toc sach
ve cam » ve cham, ve cac, va cam
cam tu » cam thu, nam tu, dam tu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach thu nang xa hoi. hieu ve cam tu ((va thanh) OR (ban thanh)) loi ((cau tren) OR (dua tren))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach thu nang xa hoi. hieu ve cam tu ((va thanh) OR (ban thanh)) loi ((cau tren) or (dua tren))~".
• Adding a wildcard symbol may retrieve word variants: te sach thu nang xa hoi. hieu ve cam tu ((va thanh) OR (ban thanh)) loi ((cau tren) or (dua tren))*.