Perhaps you should try some spelling variations:
cac truc » cac tru, cac trung, sach truc
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
lang ha » long ha
hieu ve » hieu va, hieu van
va hanh » va thanh, va danh, ban hanh
cua tuc » cua duc, cua tu, cua thuoc
ha hoi » hoa hoi, ha noi, xa hoi
vi cua » vai cua, di cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach _ lang ha hoi. hieu ve ((cac truc) OR (cau truc)) ((va hanh) OR (van hanh)) vi cua tuc~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach _ lang ha hoi. hieu ve ((cac truc) OR (cau truc)) ((va hanh) or (van hanh)) vi cua tuc~".
• Adding a wildcard symbol may retrieve word variants: te sach _ lang ha hoi. hieu ve ((cac truc) OR (cau truc)) ((va hanh) or (van hanh)) vi cua tuc*.