Perhaps you should try some spelling variations:
cau phuc » cau truc, chau phu, huu phuc
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, thien van, lieu va
su sach » vu sach
tai cuu » tai cuc, tai buu, tai cua
va hanh » va thanh, va danh, ban hanh
van cau » van dau, van hau, van chat
cao hoc » co hoc, cho hoc, chat hoc
so sach » so sanh, bo sach, co sach
cuu tre » cua tre, cau tren, cau treo

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