Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, lieu vien
vien cac » vien bach, vien dai, vien da
toc sach » hoc sach, doc sach, thuoc sach
ty hang » ly hang, ty xang, thi hang
cho hoc » co hoc, khoa hoc
ty nang » ky nang, ty xang, ly nang
cac vuc » cac nuoc, cac vung, cac cuoc
vuc van » duc van, luc van, thuc van
van anh » van thanh, tuan anh, van minh
vai cua » dai cua, lai cua, bai cua
hai cua » thai cua, dai cua, hoi 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 ((ty nang) or (ty hang)) cho hoc. hieu vien cac vuc van anh ((vai cua) OR (hai cua)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((ty nang) OR (ty hang)) cho hoc. hieu vien cac vuc van anh ((vai cua) OR (hai cua)) cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((ty nang) or (ty hang)) cho hoc. hieu vien cac vuc van anh ((vai cua) OR (hai cua)) cau*".