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
cam duc » cam xuc, cao duc, pham duc
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 cam » ve cham, ve cac, va cam
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 cam 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 cam duc tran thanh vi ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu san ky tang ((ma hoi) OR (mai hoi)). hieu ve cam 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 cam duc tran thanh vi ((cua tre) or (cua te))*.