Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
hieu viec » nhieu viec, hieu ve, sieu viet
thanh ve » hanh ve, thanh va, thanh vien
thanh vi » hanh vi, thanh va, nhanh vi
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
cuu tre » cua tre, cau tren, cau treo
cac tu » cac thu, cach tu, cac du
tu van » tu va
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 ty nang x hoi. ((hieu viec) or (hieu hien)) cac tu van ((thanh vi) OR (thanh ve)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang x hoi. ((hieu viec) OR (hieu hien)) cac tu van ((thanh vi) OR (thanh ve)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang x hoi. ((hieu viec) or (hieu hien)) cac tu van ((thanh vi) OR (thanh ve)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang x hoi. ((hieu viec) or (hieu hien)) cac tu van ((thanh vi) OR (thanh ve)) cuu tre*.