Perhaps you should try some spelling variations:
sach tranh » canh tranh
sach chinh » hanh chinh, tac chinh, tich chinh
tranh thai » trang thai, tran thi, tinh thai
soc chinh » hoc chinh, cuoc chinh, do chinh
thu sach » tu sach, thuat sach, thuoc sach
kinh tri » dinh tri, minh tri, tinh tri
vu sach » vu bach, su sach, vu khach

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((( thu ((sach chinh) OR (soc chinh)) tri ) or ( vu sach kinh tri ))) or ( thu sach tranh thai ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((( thu ((sach chinh) OR (soc chinh)) tri ) OR ( vu sach kinh tri ))) OR ( thu sach tranh thai ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((( thu ((sach chinh) OR (soc chinh)) tri ) or ( vu sach kinh tri ))) or ( thu sach tranh thai ))*".