Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
ban thanh » ban hanh, ban hang
cua triet » su triet, va triet
hieu van » hieu va, thien van, lieu va
van chay » van chat, san chay, toan chay
chay cua » chay chua, chat cua, chay dua
cua viet » ca viet, hoa viet, cua vat
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
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 chay cua ban thanh vai ((cua triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ma hoa. hieu van chay cua ban thanh vai ((cua triet) OR (cua viet)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ma hoa. hieu van chay cua ban thanh vai ((cua triet) or (cua viet))*.