Perhaps you should try some spelling variations:
dien sach » dien anh
dien dan » hien dai, vien dai, gian dan
hanh vai » hanh vi, hanh va, hanh tai
tu sach » thu sach, su sach, tu cach
te sach » toc sach
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va thanh, va danh
vai hoa » van hoa, va hoa, dai hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) OR (te sach)) ky nang xa hoi. hieu ((dien sach) or (dien dan)) nuoc va hanh vai hoa viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky nang xa hoi. hieu ((dien sach) OR (dien dan)) nuoc va hanh vai hoa viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (te sach)) ky nang xa hoi. hieu ((dien sach) or (dien dan)) nuoc va hanh vai hoa viet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (te sach)) ky nang xa hoi. hieu ((dien sach) or (dien dan)) nuoc va hanh vai hoa viet*.