Perhaps you should try some spelling variations:
nhieu viec » hieu viec, nhien viet
hieu hien » bieu hien, dieu hien, chieu chien
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
bao van » dao van, cao van, hao van
cac bao » cach bao, cac bai, cac ban
vi cua » vai cua, di cua
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) OR (su sach)) ky nang x hoi. ((nhieu viec) or (hieu hien)) cac bao van hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang x hoi. ((nhieu viec) OR (hieu hien)) cac bao van hanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) ky nang x hoi. ((nhieu viec) or (hieu hien)) cac bao van hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) ky nang x hoi. ((nhieu viec) or (hieu hien)) cac bao van hanh vi cua te*.