Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thu sach » tu sach, thuat sach, thuoc sach
thanh vi » hanh vi, thanh va, thanh ve
mai khoi » mai khoa, tai khoa, cac khoi
cua quoc » cua nuoc, cua thuoc
mai hoi » dai hoi, lai hoi, mai doi
hieu va » lieu va, hieu qua
cao duc » dao duc, cao suc, giao duc
duc van » duc va, duc tan, duc manh
y lang » o lang, _ lang, tay lang
va cao » va cac, va co, va dao
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) or (thu hoach)) y lang ((mai hoi) or (mai khoi)). hieu va cao duc van thanh vi cua quoc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thu hoach)) y lang ((mai hoi) OR (mai khoi)). hieu va cao duc van thanh vi cua quoc.
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (thu hoach)) y lang ((mai hoi) or (mai khoi)). hieu va cao duc van thanh vi cua quoc*.