Perhaps you should try some spelling variations:
cuon sach » duong sach, cuoc cach, co sach
thien van » thi van
va trien » va truyen, va thiet, va tuyen
van hanh » van thanh, ban hanh, van anh
tru van » truc van, tu van, tru va
cac tru » ca tru, cac tro, cac thu
van cac » van hac, van cau, van bac
su sach » so sach, vu sach
mai hoi » mai khoi, dai hoi, lai hoi
ma hoi » xa hoi, ma hoa, me hoi
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 (cuon sach)) y nang ((ma hoi) or (mai hoi)). thien van cac tru van hanh vi va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (cuon sach)) y nang ((ma hoi) OR (mai hoi)). thien van cac tru van hanh vi va trien.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (cuon sach)) y nang ((ma hoi) or (mai hoi)). thien van cac tru van hanh vi va trien*.