Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
hieu vien » hieu viec, thieu nien, hieu tieng
bach duoc » bach tuoc, sach duoc, ban duoc
dang van » hoang van, hang va
duoc gia » duoc giao, quoc gia, duc gia
ky dang » ky nang, ky danh
sai ky » sac ky
va cau » van cau, va dau, va cao
tu sai » tu bai, tu san, tu cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sai ky dang van hoa. ((hieu vien) or (hieu hien)) bach duoc gia thanh ((va cau) OR (va cac)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sai ky dang van hoa. ((hieu vien) OR (hieu hien)) bach duoc gia thanh ((va cau) OR (va cac)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sai ky dang van hoa. ((hieu vien) or (hieu hien)) bach duoc gia thanh ((va cau) OR (va cac)) tre".
• Adding a wildcard symbol may retrieve word variants: tu sai ky dang van hoa. ((hieu vien) or (hieu hien)) bach duoc gia thanh ((va cau) OR (va cac)) tre*.