Perhaps you should try some spelling variations:
su triet » su tien, ve triet
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
cam duc » cam xuc, cao duc, pham duc
hanh va » hang va, hanh vi
duc van » duc va, duc tan, duc manh
su viet » so viet
hieu ve » hieu va, hieu van
v nang » va nang, vu nang, van nang
ve cam » ve cham, ve cac, va cam
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ((v nang) or (cam nang)) x hoi. hieu ve cam duc van hanh va ((su triet) OR (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((v nang) OR (cam nang)) x hoi. hieu ve cam duc van hanh va ((su triet) OR (su viet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((v nang) or (cam nang)) x hoi. hieu ve cam duc van hanh va ((su triet) OR (su viet))*".