Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, lieu vien
toc sach » hoc sach, doc sach, thuoc sach
thu nang » thi nang, thu hang, thu bang
nang cho » nang chon, ngang cho, nang cao
vien cac » vien bach, vien dai, vien da
van hanh » van thanh, ban hanh, van anh
cho hoc » co hoc, khoa hoc
cac vuc » cac nuoc, cac vung, cac cuoc
vuc van » duc van, luc van, thuc van
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: ((te sach) OR (toc sach)) thu nang cho hoc. hieu vien cac vuc van hanh ((vi cua) or (dai cua)) cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) thu nang cho hoc. hieu vien cac vuc van hanh ((vi cua) OR (dai cua)) cac*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) thu nang cho hoc. hieu vien cac vuc van hanh ((vi cua) or (dai cua)) cac*".