Perhaps you should try some spelling variations:
hanh via » hanh vi, hanh va, anh va
su triet » su viet, su tien, ve triet
cach tu » cach thuc
sang ma » tang ma, nang ma, sang tao
hieu ve » hieu van
sach tu » sach thu, sach ty, sach uu
hieu va » lieu va, hieu qua
cam loc » cam lo
va hanh » van hanh, va thanh, va danh
ma hoi » mai hoi, xa hoi, ma hoa
loc va » hoc va, luc va
via su » va su, gia su

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc ((sach tu) OR (cach tu)) sang ma hoi. ((hieu ve) or (hieu va)) cam loc va hanh via su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc ((sach tu) OR (cach tu)) sang ma hoi. ((hieu ve) OR (hieu va)) cam loc va hanh via su triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc ((sach tu) OR (cach tu)) sang ma hoi. ((hieu ve) or (hieu va)) cam loc va hanh via su triet*".