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