Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thu sach » tu sach, thuat sach, thuoc sach
dung sai » dung tai, dung va, dung dat
xac dung » xay dung, tac dung, sach dung
hieu ve » hieu va, hieu van
sai cua » dai cua, hai cua, lai cua
thu xac » thau xay
tu cach » tu cac
hieu he » hiem he, hieu le, hieu hien
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cach) or (thu sach)) ky nang ma hoi. ((hieu he) OR (hieu ve)) nam thu xac dung sai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (thu sach)) ky nang ma hoi. ((hieu he) OR (hieu ve)) nam thu xac dung sai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (thu sach)) ky nang ma hoi. ((hieu he) OR (hieu ve)) nam thu xac dung sai cua triet".
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (thu sach)) ky nang ma hoi. ((hieu he) OR (hieu ve)) nam thu xac dung sai cua triet*.