Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thien van » thi van
cam thuc » am thuc, nam thuc, can thuc
van hanh » van thanh, ban hanh, van anh
sach uu » sach luu, sach tu, sach xu
cam thu » nam thu, cac thu, ca thu
su sach » so sach, vu sach
dang x » dang y, nang x, dang h
vi cua » vai cua, di 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 uu ((dang x) OR (dang _)) hoi. thien van ((cam thuc) or (cam thu)) van hanh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach uu ((dang x) OR (dang _)) hoi. thien van ((cam thuc) OR (cam thu)) van hanh vi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach uu ((dang x) OR (dang _)) hoi. thien van ((cam thuc) or (cam thu)) van hanh vi cua triet".
• Adding a wildcard symbol may retrieve word variants: su sach uu ((dang x) OR (dang _)) hoi. thien van ((cam thuc) or (cam thu)) van hanh vi cua triet*.