Perhaps you should try some spelling variations:
xa thanh » va thanh, ha thanh, ta thanh
thanh vi » hanh vi, thanh va, thanh ve
su triet » su viet, ve triet
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
cac tuc » cac toc, cac tu, cac tac
su tien » su kien, su hien, tu tieng
nang o » nang co, nang ho, nang ro
ve cac » va cac, vien cac
o hoi » co hoi, o hoc, o hai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky nang o hoi. hieu ve cac tuc xa thanh vi ((su triet) or (su tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang o hoi. hieu ve cac tuc xa thanh vi ((su triet) OR (su tien)).
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang o hoi. hieu ve cac tuc xa thanh vi ((su triet) or (su tien))*.