Perhaps you should try some spelling variations:
truong doi » truong dai, trong doi, truong hoi
xa truong » cac truong
so sanh » do sanh
sanh ty » sach ty, canh tay
ty nang » ky nang, ty xang, ty hang
hieu va » lieu va, hieu qua
cac tuc » cac toc, cac tu, cac tac
cua tre » cuu tre, cua triet, dua tren
co hoi » co hoc, co loi
cua te » cua tu
o hoi » o hoc, o hai, o hoa

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