Perhaps you should try some spelling variations:
cua triet » su triet, va triet
cua viet » ca viet, hoa viet, cua vat
dau vat » dau va, bau vat, dau mat
dan vat » dang vat, van vat, dan va
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
cac tac » cac toc, cac bac, cac dac
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
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: tu sach ky lang xa hoi. hieu va cac tac va ((dau vat) OR (dan vat)) ((cua triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky lang xa hoi. hieu va cac tac va ((dau vat) OR (dan vat)) ((cua triet) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky lang xa hoi. hieu va cac tac va ((dau vat) OR (dan vat)) ((cua triet) or (cua viet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky lang xa hoi. hieu va cac tac va ((dau vat) OR (dan vat)) ((cua triet) or (cua viet))*.