Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
dao duoc » tao duoc, dao duc, da duoc
duoc va » nuoc va, duc va, duoc ma
nang ma » sang ma, nang cao, mang may
cua tre » cua te, cuu tre, dua tren
tang ma » mang may, tang van
hanh di » hanh vi, hanh de, hang di
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
vu sac » vu sach, vu san, va sac
sac ky » cac ky, sai ky
ve dao » de dao, va dao, ve bao

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sac ky ((nang ma) OR (tang ma)) hoi. hieu ve dao duoc va hanh di ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sac ky ((nang ma) OR (tang ma)) hoi. hieu ve dao duoc va hanh di ((cua tre) OR (cua triet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sac ky ((nang ma) OR (tang ma)) hoi. hieu ve dao duoc va hanh di ((cua tre) or (cua triet))*".