Perhaps you should try some spelling variations:
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
doi cua » dai cua
hoi cua » hoi chuc
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai

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. hieu va cac tuc xa truong ((doi cua) OR (hoi cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sanh ty nang o hoi. hieu va cac tuc xa truong ((doi cua) OR (hoi cua)) tre".
• Adding a wildcard symbol may retrieve word variants: so sanh ty nang o hoi. hieu va cac tuc xa truong ((doi cua) OR (hoi cua)) tre*.