Perhaps you should try some spelling variations:
chau triet » cau triet, cua triet, cau trieu
thanh hai » thanh phan, thanh hoa, thanh san
hanh lai » hanh lam, hanh tai, thanh lap
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
van hac » van hoc, van ha, van chat
van hai » van ha, van chat, van hanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang xa hoi. hieu ((van hac) OR (van hai)) duc va ((hanh lai) or (thanh hai)) chau triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu ((van hac) OR (van hai)) duc va ((hanh lai) OR (thanh hai)) chau triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. hieu ((van hac) OR (van hai)) duc va ((hanh lai) or (thanh hai)) chau triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu ((van hac) OR (van hai)) duc va ((hanh lai) or (thanh hai)) chau triet*.