Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
va thanh » gia thanh, ban thanh, va tinh
thu sach » tu sach, thuat sach, thuoc sach
pham duy » pham duc
hieu vu » hieu va, hieu ve, hieu su
vu pham » su pham, vi pham, vu kham
va hanh » van hanh, va danh, ban hanh
tu cong » thu cong, te cong, thi cong
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: thu sach ((tu cong) OR (tai cong)) xa hoi. hieu vu pham duy ((va hanh) or (va thanh)) ve cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((tu cong) OR (tai cong)) xa hoi. hieu vu pham duy ((va hanh) OR (va thanh)) ve cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((tu cong) OR (tai cong)) xa hoi. hieu vu pham duy ((va hanh) or (va thanh)) ve cua triet".
• Adding a wildcard symbol may retrieve word variants: thu sach ((tu cong) OR (tai cong)) xa hoi. hieu vu pham duy ((va hanh) or (va thanh)) ve cua triet*.