Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
dinh cau » dinh chau, dinh cuu, dinh cu
cau theo » cau thi, cau tao
te sach » toc sach
sach ky » sac ky, sach y, sach ty
van cam » van nam, van lam, van cau
va dinh » van dinh, va kinh, vu dinh
va tinh » may tinh
x hoi » xa hoi, o hoi, 5 hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky nang ((x hoi) or (x ho)). hieu van cam xuc ((va dinh) OR (va tinh)) dinh cau theo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ((x hoi) OR (x ho)). hieu van cam xuc ((va dinh) OR (va tinh)) dinh cau theo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ((x hoi) or (x ho)). hieu van cam xuc ((va dinh) OR (va tinh)) dinh cau theo".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ((x hoi) or (x ho)). hieu van cam xuc ((va dinh) OR (va tinh)) dinh cau theo*.