Perhaps you should try some spelling variations:
thien van » thi van
su triet » su viet, su tien, ve triet
ban hanh » ban hang
duc ban » duc tan, duc van, dua ban
cam duc » cam xuc, cao duc, pham duc
te sach » toc sach
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
xang ma » tang ma, sang ma, rang ma
vi su » va su, ve su, ki su

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty ((xang ma) OR (nang ma)) hoi. ((hieu ve) OR (thien van)) cam duc ban hanh vi su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty ((xang ma) OR (nang ma)) hoi. ((hieu ve) or (thien van)) cam duc ban hanh vi su triet~".
• Adding a wildcard symbol may retrieve word variants: te sach ty ((xang ma) OR (nang ma)) hoi. ((hieu ve) or (thien van)) cam duc ban hanh vi su triet*.