Perhaps you should try some spelling variations:
thanh hoa » thanh pho
thanh hai » thanh phan, thanh san
phap hoc » phap hoan, phap mo, phap han
so sach » so sanh, bo sach, co sach
ve phap » va phap, de phap, ve phan
sach tu » sach thu, cach tu, sach ty
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
cua tre » cua te, cuu tre, cua triet

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 ((nang xa) or (lang xa)) hoi. hieu ve phap hoc dan ((thanh hai) OR (thanh hoa)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach tu ((nang xa) OR (lang xa)) hoi. hieu ve phap hoc dan ((thanh hai) OR (thanh hoa)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach tu ((nang xa) or (lang xa)) hoi. hieu ve phap hoc dan ((thanh hai) OR (thanh hoa)) cua tre".
• Adding a wildcard symbol may retrieve word variants: so sach tu ((nang xa) or (lang xa)) hoi. hieu ve phap hoc dan ((thanh hai) OR (thanh hoa)) cua tre*.