Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
sach tay » xach tay, sach hay, sach nay
tay lang » tai lang, tay tang, tay quang
van hanh » van thanh, ban hanh, van anh
lang ha » long ha
cau xuc » cam xuc, cau luc, cau truc
va hanh » va thanh, va danh, ban hanh
ha hoi » hoa hoi, ha noi, xa hoi
va cau » van cau, va cac, va dau

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 tay lang ha hoi. lieu va cau xuc ((va hanh) or (van hanh)) ((ki su) or (ky su)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach tay lang ha hoi. lieu va cau xuc ((va hanh) OR (van hanh)) ((ki su) OR (ky su)) triet.
• Adding a wildcard symbol may retrieve word variants: toc sach tay lang ha hoi. lieu va cau xuc ((va hanh) or (van hanh)) ((ki su) or (ky su)) triet*.