Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
dan vat » dang vat, van vat, dan dat
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
cac tac » cac toc, cac bac, cac dac
tac xa » tuc xa, tac da
dan va » doan va, dan ca, ban va

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