Perhaps you should try some spelling variations:
sach cua » mach cua, cach cua, sac cua
cua dang » cua cong, cua ban
dang tay » dang xay, dung tay, dan tay
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
su hien » su kien, thu hien, nhu hien
luc van » luoc van, luu van, duc van
su tien » su kien, tu tieng, dau tien
tay hoi » tay ho, tao hoi, tay thai
va dao » ca dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach cua dang tay hoi. hieu ((va cac) or (va dao)) luc van hanh vi ((su hien) OR (su tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach cua dang tay hoi. hieu ((va cac) OR (va dao)) luc van hanh vi ((su hien) OR (su tien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach cua dang tay hoi. hieu ((va cac) or (va dao)) luc van hanh vi ((su hien) OR (su tien))".
• Adding a wildcard symbol may retrieve word variants: tu sach cua dang tay hoi. hieu ((va cac) or (va dao)) luc van hanh vi ((su hien) OR (su tien))*.