Perhaps you should try some spelling variations:
tao thanh » tro thanh, dao thanh, nao thanh
su triet » su viet, ve triet
thanh vi » hanh vi, thanh va, thanh ve
tu sach » thu sach, su sach, te sach
cac tuc » cac toc, cac tu, cac tac
tuc tao » tuc tap, tuc tho, duc tao
su tien » su kien, su hien, tu tieng
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
so hoc » co hoc, mo hoc, so hoa
ve cac » va cac, vien cac
o hoc » co hoc, mo hoc, y hoc

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 ky nang ((o hoc) or (so hoc)). hieu ve cac tuc tao thanh vi ((su triet) or (su tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((o hoc) OR (so hoc)). hieu ve cac tuc tao thanh vi ((su triet) OR (su tien)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((o hoc) or (so hoc)). hieu ve cac tuc tao thanh vi ((su triet) or (su tien))*.