Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
sach ky » sac ky, sach y, sach ty
sach tu » sach thu, cach tu, sach ty
hieu ve » hieu va, hieu van
cac xuc » cam xuc, cac nuoc, chat xuc
xuc van » duc van, luc van, vuc van
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: te ((sach ky) or (sach tu)) nang o hoi. hieu ve cac xuc van hanh ((tri cua) or (tai cuc)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sach tu)) nang o hoi. hieu ve cac xuc van hanh ((tri cua) OR (tai cuc)) tre.
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) or (sach tu)) nang o hoi. hieu ve cac xuc van hanh ((tri cua) or (tai cuc)) tre*.