Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
sach thi » sach thu, sach tai, sach thieu
thi hanh » thi thanh
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
hanh xa » hanh va, hanh ma, hanh xu
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
hai su » hai vu, lai su, hai so
ve am » va am

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