Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
tu sach » thu sach, su sach, te sach
hieu va » hieu qua
mai hoi » mai khoi, dai hoi, lai hoi
y hang » ly hang, ty hang, yu hang
cham o » cham soc
va cua » va chua, via cua, ca cua
o va » do va, so va, co va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y hang ((mai hoi) or (ma hoa)). ((hieu va) OR (lieu va)) cham o va hanh va cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y hang ((mai hoi) OR (ma hoa)). ((hieu va) OR (lieu va)) cham o va hanh va cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y hang ((mai hoi) or (ma hoa)). ((hieu va) OR (lieu va)) cham o va hanh va cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach y hang ((mai hoi) or (ma hoa)). ((hieu va) OR (lieu va)) cham o va hanh va cua triet*.