Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
ban thanh » ban hanh, ban hang
vien dai » hien dai
hai cua » thai cua, hoi cua, lai cua
duc ban » duc tan, duc van, dua ban
dai duc » dao duc, dai dua, mai duc
tu sach » thu sach, su sach, tu cach
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
te sach » toc sach

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) OR (te sach)) ty nang xa hoi. hieu vien dai duc ban thanh ((hai cua) or (dai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ty nang xa hoi. hieu vien dai duc ban thanh ((hai cua) OR (dai cua)) te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (te sach)) ty nang xa hoi. hieu vien dai duc ban thanh ((hai cua) or (dai cua)) te*".