Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thanh va » thanh van, hanh va, thanh ha
va thanh » gia thanh, ban thanh, va tinh
lam thue » nam thue, lam thuoc, loai thue
hieu ve » hieu va, hieu van
su sach » so sach, vu sach
tang ma » mang may, tang van
lang xa » lang ha, dang xay, lang van
va cua » va chua, via cua, ca cua

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 ((lang xa) or (tang ma)) hoi. hieu ve ((lam thue) OR (luat thue)) va thanh va cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((lang xa) OR (tang ma)) hoi. hieu ve ((lam thue) OR (luat thue)) va thanh va cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y ((lang xa) or (tang ma)) hoi. hieu ve ((lam thue) OR (luat thue)) va thanh va cua triet".
• Adding a wildcard symbol may retrieve word variants: su sach y ((lang xa) or (tang ma)) hoi. hieu ve ((lam thue) OR (luat thue)) va thanh va cua triet*.