Perhaps you should try some spelling variations:
cau triet » cau trieu, su triet, cua triet
toc sach » hoc sach, doc sach, thuoc sach
va huong » va thuong, va phuong, va tuong
huong di » huong doi, duong di, huong dich
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cac tu » cac thu, cach tu, tac tu
di cau » da cau, diem cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky nang xa hoi. hieu va ((cac tu) or (cac du)) va huong di cau triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang xa hoi. hieu va ((cac tu) OR (cac du)) va huong di cau triet.
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang xa hoi. hieu va ((cac tu) or (cac du)) va huong di cau triet*.