Perhaps you should try some spelling variations:
bien nien » dien bien
dieu hien » dieu khien, dieu kien, bieu hien
van hanh » van thanh, ban hanh, van anh
sach ky » sac ky, sach y, sach ty
va hanh » va thanh, va danh, ban hanh
su sach » so sach, vu sach
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
cac lo » cac lop, cac co, cac bo
vi cua » vai cua, di cua
cua te » cua tu

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