Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
pham thuc » phap thuc, pham chuc, nham thuc
cham tuc » nham thuc, tham thuc, cham soc
doan vi » doan va, don vi, doan thi
va doan » va doanh, van doan, va dan
hieu ve » hieu va, hieu van
sang ma » tang ma, nang ma, sang tao
sac ky » sai ky
ma hoi » mai hoi, xa hoi, ma hoa
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: tu ((sac ky) or (cac ky)) sang ma hoi. hieu ve ((cham tuc) OR (pham thuc)) va doan vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sac ky) OR (cac ky)) sang ma hoi. hieu ve ((cham tuc) OR (pham thuc)) va doan vi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sac ky) or (cac ky)) sang ma hoi. hieu ve ((cham tuc) OR (pham thuc)) va doan vi cua triet".
• Adding a wildcard symbol may retrieve word variants: tu ((sac ky) or (cac ky)) sang ma hoi. hieu ve ((cham tuc) OR (pham thuc)) va doan vi cua triet*.