Perhaps you should try some spelling variations:
cua triet » cua viet
hieu van » hieu va, thien van, lieu va
thuc dan » thuc hanh, hoc dan, thuc vat
dan hanh » dang hanh, dan khanh, dan thanh
hanh vai » hanh vi, hanh va, hanh tai
su triet » su viet, su tien, ve triet
va triet » va thiet, va trien, ve triet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
van am » van nam, van lam, van dam
x hoi » xa hoi, o hoi, x ho

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 x hoi. hieu van am thuc dan hanh vai ((((cua triet) or (su triet))) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x hoi. hieu van am thuc dan hanh vai ((((cua triet) OR (su triet))) OR (va triet)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. hieu van am thuc dan hanh vai ((((cua triet) or (su triet))) or (va triet))*.