Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
thanh ve » hanh ve, thanh va, thanh vien
sach thu » sach thue, sach thieu, sach tham
thanh vi » hanh vi, thanh va, nhanh vi
thu nang » thi nang, thu hang, thu bang
hieu va » lieu va, hieu qua
va pham » van pham, va phat, va phap
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
su sach » so sach, vu sach

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: su sach thu nang xa hoi. hieu va pham duc va ((thanh vi) OR (thanh ve)) ((cua tre) OR (cau tren))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach thu nang xa hoi. hieu va pham duc va ((thanh vi) OR (thanh ve)) ((cua tre) or (cau tren))~".
• Adding a wildcard symbol may retrieve word variants: su sach thu nang xa hoi. hieu va pham duc va ((thanh vi) OR (thanh ve)) ((cua tre) or (cau tren))*.