Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
nang hoa » nang hoat, hang hoa, nang hoc
cam tuc » cam xuc, cam tu, nam thuc
hieu ve » hieu va, hieu van
hoa hoi » khoa hoi, hoa hoc, hoa doi
sac ky » cac ky
ve cam » ve cham, ve cac, va cam
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 ((sac ky) or (sai ky)) nang hoa hoi. hieu ve cam tuc ((van hanh) OR (ban hanh)) vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sac ky) OR (sai ky)) nang hoa hoi. hieu ve cam tuc ((van hanh) OR (ban hanh)) vi cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sac ky) or (sai ky)) nang hoa hoi. hieu ve cam tuc ((van hanh) OR (ban hanh)) vi cua triet*".