Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
hien bach » vien bach, hien hanh, dien sach
co sach » bo sach, cuon sach, hoc sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
danh di » danh du, xanh di, danh dien
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: co sach ky nang xa hoi. hieu ((hien bach) OR (thien hach)) nuoc va ((danh di) OR (hanh vi)) cua tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "co sach ky nang xa hoi. hieu ((hien bach) OR (thien hach)) nuoc va ((danh di) or (hanh vi)) cua tu~".
• Adding a wildcard symbol may retrieve word variants: co sach ky nang xa hoi. hieu ((hien bach) OR (thien hach)) nuoc va ((danh di) or (hanh vi)) cua tu*.