Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
y lang » o lang, tay lang, yen lang
_ lang » o lang, _ land
ve cac » va cac, vien cac
cac tu » cac thu, cach tu, cac du
vi cau » ve cau, di cau, viet cau
va cau » van cau, va cac, va dau

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: tu sach ((y lang) OR (_ lang)) xa hoi. hieu ve cac tu va hanh ((vi cau) OR (va cau)) treo~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y lang) OR (_ lang)) xa hoi. hieu ve cac tu va hanh ((vi cau) or (va cau)) treo~".
• Adding a wildcard symbol may retrieve word variants: tu sach ((y lang) OR (_ lang)) xa hoi. hieu ve cac tu va hanh ((vi cau) or (va cau)) treo*.