Perhaps you should try some spelling variations:
thanh toan » thanh hoa, thanh san, tinh toan
thanh van » thanh san, thanh phan, thanh nhan
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
cao hoi » cau hoi, co hoi, cao hoc
nam duc » nam duoc, pham duc, nam thuc
sac ky » cac ky, sai ky

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 y) or (sac ky)) nang cao hoi. hieu van nam duc va ((thanh van) or (thanh toan)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach y) OR (sac ky)) nang cao hoi. hieu van nam duc va ((thanh van) OR (thanh toan)) cua triet.
• Adding a wildcard symbol may retrieve word variants: tu ((sach y) or (sac ky)) nang cao hoi. hieu van nam duc va ((thanh van) or (thanh toan)) cua triet*.