Perhaps you should try some spelling variations:
ban hanh » ban hang
su triet » su viet, su tien
ve triet » va trien
hieu van » hieu va, thien van, lieu va
van phan » van phong, van thanh, luan phan
phan duc » pham duc, phan tu, phan dau
tu sach » thu sach, su sach, te sach
hanh de » hanh ve, hanh kem
sach ky » sac ky, sach y, sach ty
duc ban » duc tan, duc van, dua ban
nang xa » nang x, lang xa, nang ma
ca viet » va viet, co viet, hoa viet

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