Perhaps you should try some spelling variations:
bich ngoc » bich nga, dinh ngoc
hien bich » phien dich, chien dich, mien dich
bieu hien » dieu hien, dieu khien, bien phien
danh di » danh du, xanh di, danh dien
danh vi » hanh vi, dinh vi, danh va
ngoc va » nuoc va, ngoc ha, goc va
so sach » so sanh, bo sach, co sach
ty nang » ky nang, ty hang, ly nang
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: so sach ((ty nang) or (ty xang)) xa hoi. bieu hien bich ngoc va ((danh vi) OR (danh di)) cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((ty nang) OR (ty xang)) xa hoi. bieu hien bich ngoc va ((danh vi) OR (danh di)) cua tu*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((ty nang) or (ty xang)) xa hoi. bieu hien bich ngoc va ((danh vi) OR (danh di)) cua tu*".