Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
lang van » dang van, tang van, hoang van
cac thuc » cach thuc, cac thu, can thuc
va lang » va nang, hoa lang
so sanh » do sanh
van hoi » van hoa, van hoc, van hoe
qua cac » cua cac
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
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: ((hoc sach) or (so sanh)) va lang van hoi. hieu qua cac thuc va hanh ((vi cua) OR (di cua)) tuc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sach) OR (so sanh)) va lang van hoi. hieu qua cac thuc va hanh ((vi cua) OR (di cua)) tuc.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc sach) or (so sanh)) va lang van hoi. hieu qua cac thuc va hanh ((vi cua) OR (di cua)) tuc".
• Adding a wildcard symbol may retrieve word variants: ((hoc sach) or (so sanh)) va lang van hoi. hieu qua cac thuc va hanh ((vi cua) OR (di cua)) tuc*.