Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
hien bach » vien bach, hien hanh, dien sach
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
danh vi » dinh vi, danh di, danh va
cua tu » cua tuc, cua su, cua cu

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

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