Perhaps you should try some spelling variations:
hieu tieng » viet tieng, dien tieng, tiep tieng
hieu hien » bieu hien, dieu hien, chieu chien
nang hoa » nang hoat, hang hoa, nang hoc
bach duc » bach tuoc, sach duoc, thach duc
gia hanh » gia thanh, giao hanh, gia anh
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
duc gia » quoc gia
cua tre » cua te, cuu tre, cua triet
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 ty nang hoa hoc. ((hieu tieng) or (hieu hien)) bach duc gia hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang hoa hoc. ((hieu tieng) OR (hieu hien)) bach duc gia hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang hoa hoc. ((hieu tieng) or (hieu hien)) bach duc gia hanh vi cua tre*.