Perhaps you should try some spelling variations:
thanh doi » thanh loi, thanh moi, thanh do
dan thanh » dang thanh, danh thanh, ban thanh
hieu van » hieu va, thien van, lieu va
cam thuc » am thuc, cam thu, can thuc
lang van » dang van, tang van, hoang van
nam thuc » nam thuoc, am thuc, nam thu
doi cua » dai cua, hoi cua
so sanh » do sanh
lang xa » lang ha, dang xay
sanh y » sinh y, anh y, hanh y
cua tu » cua tuc, cua su, cua cu

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 y ((lang xa) or (lang van)) hoi. hieu van ((cam thuc) OR (nam thuc)) dan thanh doi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh y ((lang xa) OR (lang van)) hoi. hieu van ((cam thuc) OR (nam thuc)) dan thanh doi cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sanh y ((lang xa) or (lang van)) hoi. hieu van ((cam thuc) OR (nam thuc)) dan thanh doi cua tu".
• Adding a wildcard symbol may retrieve word variants: so sanh y ((lang xa) or (lang van)) hoi. hieu van ((cam thuc) OR (nam thuc)) dan thanh doi cua tu*.