Perhaps you should try some spelling variations:
hieu tieng » viet tieng, dien tieng, tiep tieng
hieu vien » hieu viec, thieu nien, nhieu viec
hieu hien » bieu hien, dieu hien, chieu chien
cac thuc » cach thuc, cac thu, can thuc
tu sach » thu sach, su sach, te sach
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
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 y nang x ho. ((((hieu vien) or (hieu tieng))) or (hieu hien)) cac thuc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang x ho. ((((hieu vien) OR (hieu tieng))) OR (hieu hien)) cac thuc va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x ho. ((((hieu vien) or (hieu tieng))) or (hieu hien)) cac thuc va hanh vi cua tre*.