Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
vat cua » mat cua, bat cua, dat cua
dan vat » dang vat, van vat, dan va
cac tac » cac toc, cac bac, cac dac
hieu va » lieu va, hieu qua
tu sach » thu sach, te sach, tu cach
nang xa » lang xa, nang ma, mang xa
su sach » so sach, vu sach
tac va » tac da, tac xa, tuc va
va dan » ca dan, va dao, va dau

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