Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
bac thuc » bao thuc, bac thua, cach thuc
va trien » va truyen, va thiet, va tuyen
su sach » so sach, vu sach
co sach » bo sach, cuon sach, hoc sach
cao hoi » cau hoi, co hoi, cao hoc
van bac » van ban, van bao, van hac
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
y nang » ky nang, ly nang, v nang
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 (co sach)) y nang cao hoi. hieu van bac thuc va hanh vi va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (co sach)) y nang cao hoi. hieu van bac thuc va hanh vi va trien.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (co sach)) y nang cao hoi. hieu van bac thuc va hanh vi va trien*.