Perhaps you should try some spelling variations:
thanh toan » thanh hoa, thanh san, tinh toan
cua triet » cua viet, su triet, va triet
toan cua » than cua, tan cua, doanh cua
nang dai » nang dau, nang tai, lang dai
hieu ve » hieu va, hieu van
dai hoa » dai khoa, dai hoc, dai hoi
xac ky » cac ky, bac ky
ve cam » ve cham, ve cac, va cam
luc va » tuc va, loc va
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: su ((xac ky) OR (sac ky)) nang dai hoa. hieu ve cam ((luc va) or (duc va)) thanh toan cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((xac ky) OR (sac ky)) nang dai hoa. hieu ve cam ((luc va) OR (duc va)) thanh toan cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((xac ky) OR (sac ky)) nang dai hoa. hieu ve cam ((luc va) or (duc va)) thanh toan cua triet".
• Adding a wildcard symbol may retrieve word variants: su ((xac ky) OR (sac ky)) nang dai hoa. hieu ve cam ((luc va) or (duc va)) thanh toan cua triet*.