Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
duc manh » suc manh, duc anh, duc minh
hanh nam » thanh nam, hanh lam, hanh ngay
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
hieu va » lieu va, hieu qua

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