Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cua triet » cua viet, su triet, va triet
dung sai » dung tai, dung va, dung dat
sai cua » dai cua, hai cua, lai cua
thu xay » thau xay, thuc xay, tu xay
hieu le » hieu ve, hieu ly, tieu le
tu sach » thu sach, su sach, te sach
ky sang » ky nang, ky dang, ky tang
sang ma » tang ma, nang ma, sang tao
hieu he » hieu ve, hiem he, hieu hien
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 sach) or (thuoc sach)) ky sang ma hoi. ((hieu he) or (hieu le)) nam thu xay dung sai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuoc sach)) ky sang ma hoi. ((hieu he) OR (hieu le)) nam thu xay dung sai cua triet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuoc sach)) ky sang ma hoi. ((hieu he) or (hieu le)) nam thu xay dung sai cua triet*.