Perhaps you should try some spelling variations:
bien phien » bien nien, bien mien, bien kien
dieu hien » dieu khien, dieu kien, bieu hien
so sach » so sanh, co sach, hoc sach
bo sach » co sach, hoc sach
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
va hanh » van hanh, va thanh, va danh
vi cua » vai cua, di cua
cac lo » cac lop, cac co, cac bo
cua te » cua tu
lo va » lo van, lao va, ly va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sach) OR (bo sach)) ky lang xa hoi. ((dieu hien) or (bien phien)) cac lo va hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (bo sach)) ky lang xa hoi. ((dieu hien) OR (bien phien)) cac lo va hanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) OR (bo sach)) ky lang xa hoi. ((dieu hien) or (bien phien)) cac lo va hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: ((so sach) OR (bo sach)) ky lang xa hoi. ((dieu hien) or (bien phien)) cac lo va hanh vi cua te*.