Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van phan » van phong, van thanh, luan phan
phan duc » pham duc, phan tu, phan dau
danh vai » danh sai, danh va, doanh van
va trien » va truyen, va thiet, va tuyen
su sach » so sach, vu sach
ly nang » ky nang, ly hang, ly vang
va danh » va dinh, va dan, va hanh
y nang » ky nang, v nang, may nang
ma hoi » mai hoi, xa hoi, ma hoa
vai va » mai va, dai va, hai 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 ((y nang) OR (ly nang)) ma hoi. hieu van phan duc va danh vai va trien~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((y nang) OR (ly nang)) ma hoi. hieu van phan duc va danh vai va trien".
• Adding a wildcard symbol may retrieve word variants: su sach ((y nang) OR (ly nang)) ma hoi. hieu van phan duc va danh vai va trien*.