Perhaps you should try some spelling variations:
toc sach » hoc sach, thuoc sach, nuoc sach
van hanh » van thanh, ban hanh, van anh
su triet » su viet, su tien, ve triet
doc sach » hoc sach, nuoc sach, dac sac
ty lang » tay lang, ty xang, ty hang
lang xa » lang ha, dang xay, lang van
cau xuc » cam xuc, cau luc, cau truc
va hanh » va thanh, va danh, ban hanh
va cau » van cau, va cac, va dau
ki su » ky su

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sach) OR (doc sach)) ty lang xa hoi. lieu va cau xuc ((va hanh) or (van hanh)) ki su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (doc sach)) ty lang xa hoi. lieu va cau xuc ((va hanh) OR (van hanh)) ki su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (doc sach)) ty lang xa hoi. lieu va cau xuc ((va hanh) or (van hanh)) ki su triet".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (doc sach)) ty lang xa hoi. lieu va cau xuc ((va hanh) or (van hanh)) ki su triet*.