Perhaps you should try some spelling variations:
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
tu sach » thu sach, su sach, te sach
cam duc » cao duc, pham duc, nam duoc
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
su viet » so viet
sach v » sach va, sach y, sach 2
ma hoi » mai hoi, xa hoi, ma hoa
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. hieu ve ((cam duc) OR (cam xuc)) ((van hanh) 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. hieu ve ((cam duc) OR (cam xuc)) ((van hanh) 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. hieu ve ((cam duc) OR (cam xuc)) ((van hanh) or (ban hanh)) vi su viet*".