Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
cua viet » ca viet, hoa viet, cua vat
va triet » va thiet, va trien, ve triet
ta tuan » tai tuan, a tuan, ba tuan
anh vai » anh va, anh bai, anh van
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
vien da » vien dai, hien dai
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
tu tuan » thu tuan, tu luan, te tuan

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 ky dang xa hoi. hieu vien da ((tu tuan) OR (ta tuan)) anh vai ((va triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky dang xa hoi. hieu vien da ((tu tuan) OR (ta tuan)) anh vai ((va triet) OR (cua viet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky dang xa hoi. hieu vien da ((tu tuan) OR (ta tuan)) anh vai ((va triet) or (cua viet))*".