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