Perhaps you should try some spelling variations:
dat duoc » dat nuoc, da duoc, luat duoc
va hanh » van hanh, va thanh, va danh
cua tre » cuu tre, cua triet, dua tren
tang ma » mang may, tang van
hieu ve » hieu va, hieu van
hanh di » hanh vi, hanh de, hang di
duoc va » nuoc va, duc va, duoc ma
ve dat » de dat, va dat, ve dao
san ky » sang ky, dan ky, ban 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) OR (van ky)) tang ma hoi. hieu ve dat 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) OR (van ky)) tang ma hoi. hieu ve dat 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) OR (van ky)) tang ma hoi. hieu ve dat duoc va hanh di ((cua tre) or (cua te))*".