Perhaps you should try some spelling variations:
tran thanh » ban thanh, van thanh, quan thanh
thanh vi » hanh vi, thanh va, thanh ve
duc tran » duc tan, duc toan, duc tren
hieu ve » hieu va, hieu van
cac duc » cac du, cao duc, cac dac
ky tang » ky nang, ky dang, kho tang
cua tre » cuu tre, cua triet, dua tren
mai hoi » mai khoi, dai hoi, lai hoi
tu san » thu san, tu ban, tu can
ve cac » va cac, vien cac
san ky » sang ky, van ky, dan ky
ma hoi » xa hoi, ma hoa, me hoi
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu san ky tang ((ma hoi) or (mai hoi)). hieu ve cac duc tran thanh vi ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky tang ((ma hoi) OR (mai hoi)). hieu ve cac duc tran thanh vi ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: tu san ky tang ((ma hoi) or (mai hoi)). hieu ve cac duc tran thanh vi ((cua tre) or (cua te))*.