Perhaps you should try some spelling variations:
hien bach » vien bach, thien hach, dien sach
hien hanh » dieu hanh
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
va danh » va dinh, va dan, va hanh
vi cua » vai cua
di cua » dai cua, doi cua, de cua

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