Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
su triet » su viet, su tien, ve triet
te sach » toc sach
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
cac tac » cac toc, cac bac, cac dac
tac cac » thac cac, tai cac, tap cac
dan va » dan ca, ban va, han va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (thu sach)) ky dang xa hoi. lieu va cac tac cac ((dan va) OR (doan va)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thu sach)) ky dang xa hoi. lieu va cac tac cac ((dan va) OR (doan va)) su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (thu sach)) ky dang xa hoi. lieu va cac tac cac ((dan va) OR (doan va)) su triet".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thu sach)) ky dang xa hoi. lieu va cac tac cac ((dan va) OR (doan va)) su triet*.