Perhaps you should try some spelling variations:
hien bach » vien bach, thien hach, dien sach
hien hanh » dieu hanh
co sach » bo sach, cuon sach, hoc 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
danh va » doanh va, hanh va, anh va
dinh ve » dinh ket, dinh van
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: co sach ky lang xa hoi. bieu ((hien bach) OR (hien hanh)) nuoc va ((danh va) or (dinh ve)) cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co sach ky lang xa hoi. bieu ((hien bach) OR (hien hanh)) nuoc va ((danh va) OR (dinh ve)) cua tu*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "co sach ky lang xa hoi. bieu ((hien bach) OR (hien hanh)) nuoc va ((danh va) or (dinh ve)) cua tu*".