Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
su triet » su viet, su tien, ve triet
sach thu » sach thue, sach thieu, sach tham
van hanh » van thanh, ban hanh, van anh
ke phan » ve phan, kenh phan, ke thang
sach tu » cach tu, sach ty, sach uu
hieu ke » hieu kem, chieu ke, hieu ky
x hoi » xa hoi, o hoi, x ho
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: so ((sach tu) OR (sach thu)) nang x hoi. hieu ke phan tu ((van hanh) or (ban thanh)) vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so ((sach tu) OR (sach thu)) nang x hoi. hieu ke phan tu ((van hanh) OR (ban thanh)) vi su triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so ((sach tu) OR (sach thu)) nang x hoi. hieu ke phan tu ((van hanh) or (ban thanh)) vi su triet*".