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
hieu va » lieu va, hieu qua
tu sach » thu sach, su sach, tu cach
nang xa » nang x, lang xa, nang ma
te sach » toc sach
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: ((tu sach) OR (te sach)) ky nang xa 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: ((tu sach) OR (te sach)) ky nang xa 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: "((tu sach) OR (te sach)) ky nang xa hoi. hieu va cac tac va ((dan vat) or (dang vat)) cua triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (te sach)) ky nang xa hoi. hieu va cac tac va ((dan vat) or (dang vat)) cua triet*.