Perhaps you should try some spelling variations:
thien van » thi van
nam thuc » nam thuoc, am thuc, nam tu
ban hang » ngan hang
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
so sac » so sach, so dac
sac ky » cac ky, sai ky
ca cua » co cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sac ky nang xa hoi. thien van ((nam thuc) OR (nam thu)) ((ban hanh) or (ban hang)) ca cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sac ky nang xa hoi. thien van ((nam thuc) OR (nam thu)) ((ban hanh) OR (ban hang)) ca cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sac ky nang xa hoi. thien van ((nam thuc) OR (nam thu)) ((ban hanh) or (ban hang)) ca cua tre".
• Adding a wildcard symbol may retrieve word variants: so sac ky nang xa hoi. thien van ((nam thuc) OR (nam thu)) ((ban hanh) or (ban hang)) ca cua tre*.