Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
van hanh » van thanh, ban hanh, van anh
duc van » duc va, duc tan, duc manh
ve cham » va cham, ve chat, vu cham
tu sach » thu sach, su sach, te sach
v nang » va nang, vu nang, van nang
ve cam » ve cac, va cam, ve cai
x hoi » xa hoi, o hoi, x ho
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 sach ((v nang) or (cam nang)) x hoi. hieu ((ve cam) OR (ve cham)) duc van hanh vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((v nang) OR (cam nang)) x hoi. hieu ((ve cam) OR (ve cham)) duc van hanh vi su triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((v nang) or (cam nang)) x hoi. hieu ((ve cam) OR (ve cham)) duc van hanh vi su triet*".