Perhaps you should try some spelling variations:
dung cong » dung trong
cam luoc » cam xuc, cam lo, dai luoc
cau tren » cu tren, dau tren, ca tren
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet

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 ky nang xa hoi. hieu ve ((cam luoc) OR (tom luoc)) tin dung cong ((cua tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. hieu ve ((cam luoc) OR (tom luoc)) tin dung cong ((cua tre) OR (cau tren))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang xa hoi. hieu ve ((cam luoc) OR (tom luoc)) tin dung cong ((cua tre) or (cau tren))*".