Perhaps you should try some spelling variations:
thanh xa » thanh ha, thanh va, thanh ba
thuc day » thuc dan
su triet » su viet, su tien, ve triet
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
hieu he » hieu ve, hiem he, hieu le
he nam » ha nam, nghe nam
vi su » va su, ve su, ki su

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) OR (thuc vat)) hanh vi su 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) OR (thuc vat)) hanh vi su triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) thi thanh xa hoi. hieu he nam ((thuc day) OR (thuc vat)) hanh vi su triet*".