Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hieu viec » nhieu viec, hieu ve, hieu hien
sieu viet » su viet, dien viet, bien viet
thanh ve » hanh ve, thanh va, thanh vien
va thanh » gia thanh, ban thanh, va tinh
va trien » va truyen, va thiet, va tuyen
sach ty » sach y, sach tu, sach thu
cac tac » cac toc, cac bac, cac dac
ty nang » ky nang, ty xang, ty hang
tac va » tac da, tac xa, tuc va
x hoi » o hoi, x ho, 5 hoi
ve va » ve van, te va, ke va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach ty nang ((x hoi) or (xa hoi)). ((hieu viec) or (sieu viet)) cac tac va thanh ve va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ty nang ((x hoi) OR (xa hoi)). ((hieu viec) OR (sieu viet)) cac tac va thanh ve va trien.
• Adding a wildcard symbol may retrieve word variants: thuoc sach ty nang ((x hoi) or (xa hoi)). ((hieu viec) or (sieu viet)) cac tac va thanh ve va trien*.