Perhaps you should try some spelling variations:
phap thuc » phap thu, phap hoc, phap tu
khanh hoa » thanh hoa, hang hoa
ban khanh » ban hanh, ban thanh, van khanh
chat tre » chay tren, chat tai, cho tre
hoa chat » hop chat, hoa phan
thuc ban » thuoc ban, thuc dan, thu ban
lang van » dang van, tang van, hoang van
sach tu » sach thu, cach tu, sach ty
hieu ve » hieu va, hieu van
ve phap » va phap, de phap, ve phan
lang xa » lang ha, dang xay
so sach » so sanh, bo sach, co sach

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sach tu ((lang xa) or (lang van)) hoi. hieu ve phap thuc ban khanh hoa chat tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach tu ((lang xa) OR (lang van)) hoi. hieu ve phap thuc ban khanh hoa chat tre.
• Adding a wildcard symbol may retrieve word variants: so sach tu ((lang xa) or (lang van)) hoi. hieu ve phap thuc ban khanh hoa chat tre*.