Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
xang xa » lang xa, mang xa, dang xay
van cac » van hac, van bac, dan cac
van cau » van dau, van hau, van chat
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
ang xa » lang xa, mang xa, dang xay
di cau » da cau, diem cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty ((xang xa) or (ang xa)) hoi. hieu ((van cac) OR (van cau)) duc va hanh di cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((xang xa) OR (ang xa)) hoi. hieu ((van cac) OR (van cau)) duc va hanh di cau tren*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty ((xang xa) or (ang xa)) hoi. hieu ((van cac) OR (van cau)) duc va hanh di cau tren*".