Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thi hang » thi nang, thi hong, thi thanh
thi hanh » thi thanh
xa thanh » va thanh, ha thanh, ta thanh
vai cua » dai cua, hai cua, lai cua
xa hanh » xa khanh, va hanh, da hanh
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
va nam » van nam, ha nam, va nay

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