Perhaps you should try some spelling variations:
trinh viet » ninh viet, trinh vat
dinh viet » ninh viet, danh viet, sinh vien
cua triet » cua viet, su triet, va triet
su sach » so sach, vu sach
nang ma » tang ma, sang ma, nang cao
va cham » va chat, va tham
danh vi » hanh vi, dinh vi, danh di
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
soc va » hoc va, loc va, doc va

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

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