Perhaps you should try some spelling variations:
dat duoc » dat nuoc, luat duoc, xuat duoc
ky tang » ky nang, ky dang, kho tang
tang ma » mang may, tang van
cua tre » cuu tre, cua triet, dua tren
hieu ve » hieu va, hieu van
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
da duoc » tao duoc, hoa duoc
vu san » va san, vu ban
san ky » sang ky, van ky, dan ky
ma hoi » mai hoi, xa hoi, ma hoa
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: vu san ky tang ma hoi. hieu ve ((dat duoc) OR (da duoc)) va hanh di ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu san ky tang ma hoi. hieu ve ((dat duoc) OR (da duoc)) va hanh di ((cua tre) OR (cua te))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu san ky tang ma hoi. hieu ve ((dat duoc) OR (da duoc)) va hanh di ((cua tre) or (cua te))*".