Perhaps you should try some spelling variations:
lang dai » lang hai, lang mai, lang chai
dai hoi » dai hoc, dai hai, dai moi
hieu ve » hieu va, hieu van
sanh va » hanh va, anh va, sinh va
thuc va » thuc dan, thuc day
va lang » va nang, hoa lang
doi cua » dai cua, hoi cua
so sanh » do sanh
ve cam » ve cham, ve cac, va cam
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 va lang dai hoi. hieu ve cam ((thuc va) or (thuc vat)) hanh ((vi cua) or (doi cua)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh va lang dai hoi. hieu ve cam ((thuc va) OR (thuc vat)) hanh ((vi cua) OR (doi cua)) viet.
• Adding a wildcard symbol may retrieve word variants: so sanh va lang dai hoi. hieu ve cam ((thuc va) or (thuc vat)) hanh ((vi cua) or (doi cua)) viet*.