Perhaps you should try some spelling variations:
dinh chau » minh chau, tinh chat, dinh chi
chau tao » cau tao, chau tho, che tao
hieu van » hieu va, thien van, lieu va
va hanh » van hanh, va thanh, va danh
cam hoc » cao hoc, am hoc, cam hoa
su sach » so sach, vu sach
ky danh » ky anh
ky dang » ky nang
van cam » van nam, van lam, van cau
va anh » van anh, va danh, va banh

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