Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
toc sach » hoc sach, doc sach, thuoc sach
hanh vai » hanh vi, hanh va, hanh tai
vu cham » va cham, vu kham, tu cham
vai cau » va cau, van cau, vai cac
va hanh » van hanh, va thanh, va danh
mang xa » lang xa, mang may, dang xay
ty mang » ty xang, ty hang, tin mang
ve cham » va cham, ve chat, ve chim
tuc va » thuc va, truc va, tuc xa

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) OR (toc sach)) ty mang xa hoi. hieu ((ve cham) or (vu cham)) tuc va hanh vai cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ty mang xa hoi. hieu ((ve cham) OR (vu cham)) tuc va hanh vai cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ty mang xa hoi. hieu ((ve cham) or (vu cham)) tuc va hanh vai cau tren".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) ty mang xa hoi. hieu ((ve cham) or (vu cham)) tuc va hanh vai cau tren*.