Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
kham cuu » cham cuu, khao cuu, kham chua
van hanh » van thanh, ban hanh, van anh
so sanh » do sanh
sanh ty » sach ty, canh tay
lang ha » long ha
hieu vu » hieu va, hieu ve, hieu su
vu kham » vu khanh
cua tre » cua te, cuu tre, dua tren

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 cao) or (lang ha)) hoi. hieu vu kham cuu van hanh vi ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh ty ((nang cao) OR (lang ha)) hoi. hieu vu kham cuu van hanh vi ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sanh ty ((nang cao) or (lang ha)) hoi. hieu vu kham cuu van hanh vi ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: so sanh ty ((nang cao) or (lang ha)) hoi. hieu vu kham cuu van hanh vi ((cua tre) OR (cua triet))*.