Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
dang vat » dang van, dong vat, dang nhat
dan vat » van vat, dan va, dan dat
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
te sach » toc 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 va » tac da, tac xa, tuc va

You may be able to get more results by adjusting your search query.

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