Perhaps you should try some spelling variations:
sach thue » sach thu, sach thieu, sach tham
thue hang » thu hang, thuy hang, thue thanh
truc van » truc va, thuc van, truc ban
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
cua hoi » cua moi
hieu ca » hieu cac, hieu cua, hieu va
ca hoi » cau hoi, xa hoi, co hoi
ca cau » cua cau, cac cau, can cau

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 thue hang ((ca hoi) or (cua hoi)). hieu ca cau truc van hanh ((dang su) or (dai so)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thue hang ((ca hoi) OR (cua hoi)). hieu ca cau truc van hanh ((dang su) OR (dai so)) triet.
• Adding a wildcard symbol may retrieve word variants: su sach thue hang ((ca hoi) or (cua hoi)). hieu ca cau truc van hanh ((dang su) or (dai so)) triet*.