Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
tang mam » dang mam, mang mam, tang dam
cuc tre » duc tre, cua tre, cuu tre
cao duc » dao duc, cao suc, giao duc
cam duc » cam xuc, pham duc, nam duoc
hieu ve » hieu va, hieu van
tang ma » mang may, tang van
sac ky » cac ky, sai ky
tu sac » tu sach, tu cac, tu san

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky ((tang ma) or (tang mam)) hoi. hieu ve ((cam duc) OR (cao duc)) gia thanh tai cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((tang ma) OR (tang mam)) hoi. hieu ve ((cam duc) OR (cao duc)) gia thanh tai cuc tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky ((tang ma) or (tang mam)) hoi. hieu ve ((cam duc) OR (cao duc)) gia thanh tai cuc tre".
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((tang ma) or (tang mam)) hoi. hieu ve ((cam duc) OR (cao duc)) gia thanh tai cuc tre*.