Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
hieu hien » bieu hien, dieu hien, chieu chien
hieu viec » nhieu viec, hieu ve, sieu viet
thanh vi » hanh vi, thanh va, thanh ve
tu sach » thu sach, te sach, tu cach
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
su sach » so sach, vu sach
cac tu » cac thu, cach tu, cac du
tu van » tu va
vi cua » vai cua, di cua

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