Perhaps you should try some spelling variations:
so sanh » do sanh
tu tang » tuc tang, tu trang, tu lang
tu tong » tu tuong, tu trong, tu dong
hieu ve » hieu va, hieu van
truc va » thuc va, thuc vat, trung va
va hanh » van hanh, va thanh, va danh
ve cau » ke cau, va cau, ve cac
vi cua » vai cua
di cua » dai cua, doi cua, de 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 ((tu tang) OR (tu tong)) van hoa. hieu ve cau truc va hanh ((vi cua) or (di cua)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh ((tu tang) OR (tu tong)) van hoa. hieu ve cau truc va hanh ((vi cua) OR (di cua)) viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sanh ((tu tang) OR (tu tong)) van hoa. hieu ve cau truc va hanh ((vi cua) or (di cua)) viet".
• Adding a wildcard symbol may retrieve word variants: so sanh ((tu tang) OR (tu tong)) van hoa. hieu ve cau truc va hanh ((vi cua) or (di cua)) viet*.