Perhaps you should try some spelling variations:
hieu quan » lieu quan, thien quan, lien quan
bach van » bach dan, cach van, bach dang
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
su triet » su viet, su tien, ve triet
van tang » van thang, van trang, van nang
cam luc » cam xuc, cau luc
tang ma » mang may, tang van
tu bach » vu bach, tu cach, tu bac
ma hoi » mai hoi, xa hoi, ma hoa
vi su » va su, ve su, ki su

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu bach van tang ma hoi. ((hieu qua) or (hieu quan)) cam luc ((van hanh) or (ban hanh)) vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu bach van tang ma hoi. ((hieu qua) OR (hieu quan)) cam luc ((van hanh) OR (ban hanh)) vi su triet.
• Adding a wildcard symbol may retrieve word variants: tu bach van tang ma hoi. ((hieu qua) or (hieu quan)) cam luc ((van hanh) or (ban hanh)) vi su triet*.