Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
ban thanh » ban hanh, ban hang
hieu viec » nhieu viec, hieu ve, sieu viet
van thanh » van tuan
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
cuu tre » cua tre, cau tren, cau treo
cac tu » cac thu, cach tu, cac du
vi cuu » vi luu, vinh cuu

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 xa hoi. ((hieu viec) or (hieu hien)) cac tu ((van thanh) OR (ban thanh)) vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang xa hoi. ((hieu viec) OR (hieu hien)) cac tu ((van thanh) OR (ban thanh)) vi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang xa hoi. ((hieu viec) or (hieu hien)) cac tu ((van thanh) OR (ban thanh)) vi cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. ((hieu viec) or (hieu hien)) cac tu ((van thanh) OR (ban thanh)) vi cuu tre*.