Perhaps you should try some spelling variations:
sang mai » sang ma, sang tai, lang mai
lang hai » lang chai, lang thai, lang ha
cam thuc » am thuc, nam thuc, cam thu
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
so sanh » do sanh
hieu ve » hieu va, hieu van
sanh v » sanh va, canh v, sanh _
ve cam » ve cham, ve cac, va cam
vi 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 v ((sang mai) or (lang hai)) hoi. hieu ve cam thuc va hanh ((vi cua) or (vai cua)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh v ((sang mai) OR (lang hai)) hoi. hieu ve cam thuc va hanh ((vi cua) OR (vai cua)) viet.
• Adding a wildcard symbol may retrieve word variants: so sanh v ((sang mai) or (lang hai)) hoi. hieu ve cam thuc va hanh ((vi cua) or (vai cua)) viet*.