Perhaps you should try some spelling variations:
cua triet » su triet, va triet
cua viet » ca viet, hoa viet, cua vat
hieu van » hieu va, thien van, lieu va
hang doi » hang di, hang loi, huong doi
van hang » van khang, van hoang, van thang
van cham » van chat, van tham, va cham
lang xa » lang ha, dang xay, lang van
cham lo » cham o, cam lo, cham soc
nang xa » nang x, nang ma, mang xa
tu sach » thu sach, su sach, te sach
lo van » le van, vo van, so van

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