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