Perhaps you should try some spelling variations:
manh hanh » xanh hanh, danh thanh, minh thanh
hieu van » hieu va, thien van, lieu va
duc manh » suc manh, duc anh, duc minh
su sach » vu sach
so sach » so sanh, bo sach, co sach
van cau » van dau, van hau, van chat
cau duc » cao duc, cau luc, chu duc
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang
vi va » vi van, vai va, vu va
thiet » thieu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ((y nang) OR (v nang)) xa hoi. hieu van cau duc manh hanh vi va thiet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) ((y nang) or (v nang)) xa hoi. hieu van cau duc manh hanh vi va thiet~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (so sach)) ((y nang) or (v nang)) xa hoi. hieu van cau duc manh hanh vi va thiet*.