Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
van hanh » van thanh, ban hanh, van ban
su triet » su viet, su tien
ve triet » va trien
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
van anh » van thanh, tuan anh, van minh

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 xa hoi. hieu van pham duc ((van hanh) or (van anh)) dan ((su triet) or (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu van pham duc ((van hanh) OR (van anh)) dan ((su triet) OR (ve triet)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu van pham duc ((van hanh) or (van anh)) dan ((su triet) or (ve triet))*.