Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
dan vat » dang vat, van vat, dan va
dan vai » dan va, dan tai, den vai
sach ky » sac ky, sach y, sach ty
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
cac tuc » cac toc, cac tu, cac tac
tuc va » thuc va, truc va, tuc xa

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