Perhaps you should try some spelling variations:
hoang van » hang va
tham thuc » nham thuc, pham thuc, tam thuc
hoc sach » hoc sinh, hoc cac, hoc anh
lang van » dang van, tang van, giang van
thuc van » thuc vat, thuc dan, thuc va
hieu ve » hieu va, hieu van
ve tham » va tham, ve cham, vi tham
van anh » van thanh, tuan anh, van minh
anh di » danh di, xanh di, anh d
cua tu » cua tuc, cua cu, cua te
cua su » qua su

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 _ ((lang van) or (hoang van)) hoa. hieu ve tham thuc van anh di ((cua tu) OR (cua su))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach _ ((lang van) OR (hoang van)) hoa. hieu ve tham thuc van anh di ((cua tu) OR (cua su)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach _ ((lang van) or (hoang van)) hoa. hieu ve tham thuc van anh di ((cua tu) OR (cua su))".
• Adding a wildcard symbol may retrieve word variants: hoc sach _ ((lang van) or (hoang van)) hoa. hieu ve tham thuc van anh di ((cua tu) OR (cua su))*.