Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
tay lang » tai lang, tay tang, tay quang
van hanh » van thanh, ban hanh, van anh
su triet » su viet, su tien, ve triet
cau xuc » cam xuc, cau luc, cau truc
va hanh » va thanh, va danh, ban hanh
ty lang » ty xang, ty hang, tu lang
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 ((ty lang) OR (tay 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 ((ty lang) OR (tay 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 ((ty lang) OR (tay 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 ((ty lang) OR (tay lang)) xa hoi. lieu va cau xuc ((va hanh) or (van hanh)) ki su triet*.