Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
ky danh » ky anh, ky dang
van cam » van nam, van lam, van cau
cuu tre » cua tre, cau tren, cau treo
luc va » duc va, tuc va
loc va » hoc va
vi cuu » vi luu, vinh cuu

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 ((ky nang) or (ky danh)) xa hoi. hieu van cam ((luc va) OR (loc va)) hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ky nang) OR (ky danh)) xa hoi. hieu van cam ((luc va) OR (loc va)) hanh vi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ky nang) or (ky danh)) xa hoi. hieu van cam ((luc va) OR (loc va)) hanh vi cuu tre".
• Adding a wildcard symbol may retrieve word variants: su sach ((ky nang) or (ky danh)) xa hoi. hieu van cam ((luc va) OR (loc va)) hanh vi cuu tre*.