Perhaps you should try some spelling variations:
cac trung » cac truong, dac trung, cao trung
bac trung » ba trung, dac trung, bao trung
so sanh » do sanh
sang xa » song xa, lang xa, sang ma
va hanh » van hanh, va thanh, va danh
sanh y » sinh y, anh y, hanh y
y sang » _ sang, duy sang
vi cua » vai cua, di cua

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 y sang xa hoi. hieu qua ((cac trung) OR (bac trung)) va hanh ((vi cua) or (dai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh y sang xa hoi. hieu qua ((cac trung) OR (bac trung)) va hanh ((vi cua) OR (dai cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sanh y sang xa hoi. hieu qua ((cac trung) OR (bac trung)) va hanh ((vi cua) or (dai cua)) triet".
• Adding a wildcard symbol may retrieve word variants: so sanh y sang xa hoi. hieu qua ((cac trung) OR (bac trung)) va hanh ((vi cua) or (dai cua)) triet*.