Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thanh xa » thanh ha, thanh va, thanh ba
nam thuc » nam thuoc, am thuc, nam thu
thuc day » thuc dan, thuc vat
day hanh » day nhanh, day thanh, dao hanh
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
hieu he » hieu ve, hiem he, hieu le
hanh va » hang va, hanh vi
he nam » ha nam, nghe nam
va cua » va chua, via cua, ca cua

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)) thi thanh xa hoi. hieu he nam thuc day hanh va cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) thi thanh xa hoi. hieu he nam thuc day hanh va cua triet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) thi thanh xa hoi. hieu he nam thuc day hanh va cua triet*.