Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
thu sach » tu sach, thuat sach, thuoc sach
quan anh » quan hanh, quang anh, tuan anh
luc quan » luc luan, tac quan, qua quan
vien cac » vien bach, vien dai, vien da
cac luc » cau luc, coc luc, cac nuoc
vai cua » dai cua, hai cua, lai cua
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, ma hoa, me hoi
di cua » dai cua, doi cua, de cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y nang ((ma hoi) OR (xa hoi)). hieu vien cac luc quan anh ((di cua) or (vai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang ((ma hoi) OR (xa hoi)). hieu vien cac luc quan anh ((di cua) OR (vai cua)) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y nang ((ma hoi) OR (xa hoi)). hieu vien cac luc quan anh ((di cua) or (vai cua)) tre*".