Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, lieu vien
toc sach » doc sach, thuoc sach, nuoc sach
vien cac » vien bach, vien dai, vien da
hoc sach » hoc sinh, hoc cac, hoc anh
ty nang » ky nang, ty hang, ly nang
cho hoc » co hoc, khoa hoc
cac luc » cau luc, coc luc, cac nuoc
luc van » luoc van, luu van, duc van
minh vi » minh voi, dinh vi, minh 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: ((toc sach) or (hoc sach)) ((ty nang) OR (ty xang)) cho hoc. hieu vien cac luc van minh vi cua cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) ((ty nang) OR (ty xang)) cho hoc. hieu vien cac luc van minh vi cua cac*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) or (hoc sach)) ((ty nang) OR (ty xang)) cho hoc. hieu vien cac luc van minh vi cua cac*".