Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
khoa hoi » khoan hoi, khoa hoc, khoa doi
hoa hoi » hoa hoc, hoa doi, hoc hoi
hieu ve » hieu va, hieu van
cam tuc » cam xuc, cam tu, nam thuc
va hanh » van hanh, va thanh, va danh
hanh ki » hanh vi, hanh ky, hanh kien
sac ky » cac ky
ve cam » ve cham, ve cac, va cam
tuc va » thuc va, truc va, tuc xa
ki su » ky su

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)) hang ((hoa hoi) OR (khoa hoi)). hieu ve cam tuc va hanh ki su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sac ky) OR (sai ky)) hang ((hoa hoi) OR (khoa hoi)). hieu ve cam tuc va hanh ki su triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sac ky) or (sai ky)) hang ((hoa hoi) OR (khoa hoi)). hieu ve cam tuc va hanh ki su triet*".