Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
man trinh » man tinh, dan trinh, van trinh
cay phoi » cap phoi, tay hoi, cay cho
trinh ve » trinh he, trinh va, trinh vi
vien cac » vien bach, vien dai, gian cac
xay hoi » xa hoi, tay hoi, gay thoi
sach ky » sac ky, sach y, sach ty
vien da » vien dai, hien dai
ky danh » ky anh, ky dang
te sach » toc sach
du man » duc man, vu man, duc manh
ve cua » le cua, de cua, te cua

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 danh ((xay hoi) or (cay phoi)). hieu ((vien cac) or (vien da)) du man trinh ve cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky danh ((xay hoi) OR (cay phoi)). hieu ((vien cac) OR (vien da)) du man trinh ve cua triet.
• Adding a wildcard symbol may retrieve word variants: te sach ky danh ((xay hoi) or (cay phoi)). hieu ((vien cac) or (vien da)) du man trinh ve cua triet*.