Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
vien cac » vien bach, vien dai, vien da
hanh hai » thanh hai, nhanh hai, hang hai
ban hanh » ban hang
hai cua » thai cua, dai cua, hoi cua
duc ban » duc tan, duc van, dua ban
su sach » so sach, vu sach
xay hoi » xa hoi, tay hoi, cay phoi
ky danh » ky anh
ky dang » ky nang
ve cac » va cac

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)) xay hoi. hieu ((ve cac) or (vien cac)) duc ban hanh hai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ky dang) OR (ky danh)) xay hoi. hieu ((ve cac) OR (vien cac)) duc ban hanh hai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ky dang) OR (ky danh)) xay hoi. hieu ((ve cac) or (vien cac)) duc ban hanh hai cua triet".
• Adding a wildcard symbol may retrieve word variants: su sach ((ky dang) OR (ky danh)) xay hoi. hieu ((ve cac) or (vien cac)) duc ban hanh hai cua triet*.