Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
su triet » su viet, su tien, ve triet
xa dung » xay dung, xa dong, va dung
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
cam tuc » cam xuc, nam thuc, dam thuc
nang xa » nang x, lang xa, nang ma
cam tu » cam thu, nam tu, dam tu

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