Perhaps you should try some spelling variations:
vuc nang » cuc nang, vu nang, chuc nang
van hanh » van thanh, ban hanh, van anh
truc van » truc va, thuc van, truc ban
su sach » vu sach
hanh va » hang va, hanh vi
qua cau » quan cau, qua cac, qua ca
so sach » so sanh, bo sach, co sach
ca viet » va viet, co viet, hoa viet
ma hoi » mai hoi, xa hoi, ma hoa
v nang » va nang, vu nang, van nang
va ca » va cac, va cao, va cai

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

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