Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
dan vai » dan va, dan tai, dan vat
so viet » hoc viet
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
toc ca » toc cao, toc ta, toc ba
toc co » hoc co, tuc co

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. lieu va cac ((toc ca) OR (toc co)) dan vai ((su triet) or (so viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky dang xa hoi. lieu va cac ((toc ca) OR (toc co)) dan vai ((su triet) OR (so viet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky dang xa hoi. lieu va cac ((toc ca) OR (toc co)) dan vai ((su triet) or (so viet))*".