Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hai chuc » hoi chuc, hai chu, hai cuc
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
chuc va » thuc va, thuc vat
hanh va » hanh vi
va hai » van hai, va chai, va khai

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