Perhaps you should try some spelling variations:
duoc van » duoc va, duc van, duoc ban
hanh via » hanh vi, hanh va, anh va
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
ty hang » ty xang, thi hang, thu hang
via cua » gia cua, gian cua, giau cua
ly hang » ly quang
hieu ve » hieu va
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: tu sach ((ty hang) OR (ly hang)) cau hoi. ((hieu ve) or (hieu van)) tao duoc van hanh via cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty hang) OR (ly hang)) cau hoi. ((hieu ve) OR (hieu van)) tao duoc van hanh via cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty hang) OR (ly hang)) cau hoi. ((hieu ve) or (hieu van)) tao duoc van hanh via cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty hang) OR (ly hang)) cau hoi. ((hieu ve) or (hieu van)) tao duoc van hanh via cua te*.