Perhaps you should try some spelling variations:
hieu tieng » viet tieng, dien tieng, tiep tieng
dieu hien » dieu khien, dieu kien, bieu hien
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
bai va » mai va, ban va, bai ca
dai va » mai va
vi cua » vai cua, di cua

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

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