Perhaps you should try some spelling variations:
va trien » va truyen, va thiet, va tuyen
phan duc » pham duc, phan tu, phan dau
hieu van » hieu va, thien van, lieu va
van phan » van phong, van thanh, luan phan
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
so sach » so sanh, bo sach, co sach
va danh » va dan, va hanh, dia danh
va dinh » van dinh, va kinh, va tinh
su sach » vu sach
vi va » vi van, vai va, vu va

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) OR (so sach)) ty nang xa hoi. hieu van phan duc ((va danh) or (va dinh)) vi va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ty nang xa hoi. hieu van phan duc ((va danh) OR (va dinh)) vi va trien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) ty nang xa hoi. hieu van phan duc ((va danh) or (va dinh)) vi va trien".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (so sach)) ty nang xa hoi. hieu van phan duc ((va danh) or (va dinh)) vi va trien*.