Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
vien dai » hien dai
sach ty » sach y, sach tu, sach thu
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
lai cau » lai chau, lai cam, loi cau
te sach » toc sach
ang xa » lang xa, mang xa, dang xay
ve cac » va cac, vien cac
ty ang » ty xang, ty hang, ty anh

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 ty ang xa hoi. hieu ((ve cac) or (vien dai)) tuc ((va hanh) OR (va danh)) lai cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty ang xa hoi. hieu ((ve cac) OR (vien dai)) tuc ((va hanh) OR (va danh)) lai cau tren*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty ang xa hoi. hieu ((ve cac) or (vien dai)) tuc ((va hanh) OR (va danh)) lai cau tren*".