Perhaps you should try some spelling variations:
cau triet » cau trieu, su triet, cua triet
tay quang » tac quang, tai quang, tao quang
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
hanh ve » hanh vi, hanh kem
hanh va » hang va, hanh vi
cac tu » cac thu, cach tu, cac du

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