Perhaps you should try some spelling variations:
van chat » cao chat
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, tu cach
te sach » toc sach
nang xa » nang x, lang xa, nang ma
va chat » va phat, cao chat, hoa chat
soc van » hoc van, oc van, sac van
cuu tre » cua tre, cau tren, cau treo
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: ((tu sach) or (te sach)) ky nang xa hoi. hieu ((va chat) OR (van chat)) soc van hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky nang xa hoi. hieu ((va chat) OR (van chat)) soc van hanh vi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) ky nang xa hoi. hieu ((va chat) OR (van chat)) soc van hanh vi cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ky nang xa hoi. hieu ((va chat) OR (van chat)) soc van hanh vi cuu tre*.