Perhaps you should try some spelling variations:
co sach » bo sach, cuon sach, hoc sach
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va thanh, va danh
y nang » ky nang, ly nang, v nang
ly dat » ly dai, ly mat, ly da
ly dao » ly dai
vi cuu » vinh cuu
vi luu » vi lua

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 y nang xa hoi. hieu ((ly dat) or (ly dao)) nuoc va hanh ((vi cuu) OR (vi luu)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co sach y nang xa hoi. hieu ((ly dat) OR (ly dao)) nuoc va hanh ((vi cuu) OR (vi luu)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "co sach y nang xa hoi. hieu ((ly dat) or (ly dao)) nuoc va hanh ((vi cuu) OR (vi luu)) tre".
• Adding a wildcard symbol may retrieve word variants: co sach y nang xa hoi. hieu ((ly dat) or (ly dao)) nuoc va hanh ((vi cuu) OR (vi luu)) tre*.