Perhaps you should try some spelling variations:
thuong doi » huong doi, tuong doi, thuong dong
so sanh » do sanh
sanh ty » sach ty, canh tay
doi cua » dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu van
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
tuc va » thuc va, truc va, duc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sanh ty nang xa hoi. ((hieu ve) OR (hieu va)) cam ((tuc va) or (tuc xa)) thuong doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh ty nang xa hoi. ((hieu ve) OR (hieu va)) cam ((tuc va) OR (tuc xa)) thuong doi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sanh ty nang xa hoi. ((hieu ve) OR (hieu va)) cam ((tuc va) or (tuc xa)) thuong doi cua tre".
• Adding a wildcard symbol may retrieve word variants: so sanh ty nang xa hoi. ((hieu ve) OR (hieu va)) cam ((tuc va) or (tuc xa)) thuong doi cua tre*.