Perhaps you should try some spelling variations:
co sach » bo sach, cuon sach, hoc sach
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau tren, cau treo
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang
ly dat » ly dai, ly mat, ly da
ly dao » ly dai
vi cuu » vi luu, vinh cuu

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