Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
nhan tai » hang tai, van tai, toan tai
hanh tai » thanh tai, hang tai, han tai
cac thuc » cach thuc, cac thu, can thuc
thi hanh » thi thanh
thi hang » thi nang, thi hong, thi thanh
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
tu sach » thu sach, su sach, te sach

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 cac thuc va ((hanh tai) or (nhan tai)) 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 cac thuc va ((hanh tai) OR (nhan tai)) 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 cac thuc va ((hanh tai) or (nhan tai)) cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ((thi hang) OR (thi hanh)) xa hoi. hieu va cac thuc va ((hanh tai) or (nhan tai)) cua triet*.