Perhaps you should try some spelling variations:
trinh viet » ninh viet, trinh vat
cua triet » cua viet, su triet, va triet
tham soc » cham soc, tham nuoc, ham so
thai son » thai den, thai do, thai hoc
danh vi » hanh vi, dinh vi, danh di
nang ma » tang ma, sang ma, nang cao
so sach » so sanh, bo sach, co sach
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach y nang ma hoi. lieu va ((tham soc) OR (thai son)) va ((danh vi) or (trinh viet)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y nang ma hoi. lieu va ((tham soc) OR (thai son)) va ((danh vi) OR (trinh viet)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y nang ma hoi. lieu va ((tham soc) OR (thai son)) va ((danh vi) or (trinh viet)) cua triet".
• Adding a wildcard symbol may retrieve word variants: so sach y nang ma hoi. lieu va ((tham soc) OR (thai son)) va ((danh vi) or (trinh viet)) cua triet*.