Perhaps you should try some spelling variations:
cao luc » bao luc, cao duc, cao suc
va hanh » van hanh, va thanh, va danh
hanh ca » hanh cac, hanh cat, hanh cua
cua tre » cuu tre, cua triet, dua tren
bai ky » sai ky, bac ky, dai ky
ban ky » van ky, dan ky
nang o » nang co, nang ho, nang ro
va cao » va cac, va co, va dao
luc va » duc va, tuc va, loc va
cua te » cua tu
o hai » co hai, so hai, o lai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((bai ky) or (ban ky)) nang o hai. lieu va cao luc va hanh ca ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((bai ky) OR (ban ky)) nang o hai. lieu va cao luc va hanh ca ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((bai ky) or (ban ky)) nang o hai. lieu va cao luc va hanh ca ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: tu ((bai ky) or (ban ky)) nang o hai. lieu va cao luc va hanh ca ((cua tre) OR (cua te))*.