Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
ban hanh » ban hang
tu sach » thu sach, su sach, te sach
cam duc » cam xuc, cao duc, pham duc
hieu ve » hieu va, hieu van
su viet » so viet
sach v » sach va, sach y, sach 2
ve cam » ve cham, ve cac, va cam
ma hoi » mai hoi, ma hoa, me hoi
v nang » va nang, vu nang, van nang
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 ((ma hoi) OR (xa hoi)). hieu ve cam duc ((van thanh) or (ban hanh)) vi su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach v nang ((ma hoi) OR (xa hoi)). hieu ve cam duc ((van thanh) OR (ban hanh)) vi su viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach v nang ((ma hoi) OR (xa hoi)). hieu ve cam duc ((van thanh) or (ban hanh)) vi su viet*".