Perhaps you should try some spelling variations:
cau viet » ca viet, chu viet, cao viet
sach ty » sach tu, sach thu, xach tay
hieu va » lieu va, hieu qua
cau xuc » cam xuc, cau luc, cau truc
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
va cau » van cau, va cac, va dau
xuc va » duc va, tuc va, luc va
di cau » da cau, diem cau
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 ty) or (sach y)) nang ((x hoi) OR (x ho)). hieu va cau xuc va hanh di cau viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ty) OR (sach y)) nang ((x hoi) OR (x ho)). hieu va cau xuc va hanh di cau viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ty) or (sach y)) nang ((x hoi) OR (x ho)). hieu va cau xuc va hanh di cau viet".
• Adding a wildcard symbol may retrieve word variants: te ((sach ty) or (sach y)) nang ((x hoi) OR (x ho)). hieu va cau xuc va hanh di cau viet*.