Perhaps you should try some spelling variations:
thanh ha » thanh hoa, thanh hai, nhanh ha
toc sach » hoc sach, doc sach, thuoc sach
cao duc » dao duc, cao suc, giao duc
cam duc » cam xuc, pham duc, nam duoc
chi tre » choi tre, cho tre, chi tro
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
ty lang » tay lang, ty xang, ty hang
ha chi » hai chi, ho chi, ha thi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) OR (toc sach)) ty lang xa hoi. hieu ve ((cam duc) or (cao duc)) gia thanh ha chi tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ty lang xa hoi. hieu ve ((cam duc) OR (cao duc)) gia thanh ha chi tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ty lang xa hoi. hieu ve ((cam duc) or (cao duc)) gia thanh ha chi tre*".