Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thanh lap » thanh san, phan lap, thanh hai
hieu van » hieu va, thien van, lieu va
hanh lai » hanh lam, hanh tai, thanh loi
tu sach » thu sach, su sach, te sach
mai duc » mai dich, mai quoc, mai dung
sach ky » sac ky, sach y, sach ty
hai duc » hoai duc, ha duc, hai cuc
nang ma » tang ma, sang ma, nang cao

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 nang ma hoa. hieu van ((hai duc) or (mai duc)) va ((hanh lai) or (thanh lap)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ma hoa. hieu van ((hai duc) OR (mai duc)) va ((hanh lai) OR (thanh lap)) cua triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ma hoa. hieu van ((hai duc) or (mai duc)) va ((hanh lai) or (thanh lap)) cua triet*.