Perhaps you should try some spelling variations:
lang van » dang van, tang van, hoang van
thuc dan » thuc hanh, hoc dan
ky lang » ky nang, ky dang, ky tang
van hoi » van hoa, van hoc, van hoe
hieu ve » hieu va, hieu van
su cac » tu cac, su cao, su can
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.

• If you are trying to use Boolean operators, they must be ALL CAPS: su cac ky lang van hoi. hieu ve cam ((thuc dan) OR (thuc vat)) hanh ((vi cua) OR (dai cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su cac ky lang van hoi. hieu ve cam ((thuc dan) OR (thuc vat)) hanh ((vi cua) or (dai cua)) tre~".
• Adding a wildcard symbol may retrieve word variants: su cac ky lang van hoi. hieu ve cam ((thuc dan) OR (thuc vat)) hanh ((vi cua) or (dai cua)) tre*.