Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van thac » van hac, van tham, van than
thac toc » cac toc, thac cac, thi toc
van hanh » van thanh, ban hanh, van ban
su triet » su viet, su tien, ve triet
su sach » so sach, vu sach
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
van anh » van thanh, tuan anh, van minh
hai su » hai vu, lai su, hai so
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: su sach tu nang x hoi. hieu van thac toc ((van hanh) or (van anh)) hai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach tu nang x hoi. hieu van thac toc ((van hanh) OR (van anh)) hai su triet.
• Adding a wildcard symbol may retrieve word variants: su sach tu nang x hoi. hieu van thac toc ((van hanh) or (van anh)) hai su triet*.