Perhaps you should try some spelling variations:
bieu hien » dieu hien, dieu khien, bien phien
hien hanh » dieu hanh
hanh xuc » hanh xu, hanh phuc, hanh duoc
xuc may » xuc hay, truc may, phuc may
sach ky » sac ky, sach y, sach kem
sach ty » sach y, sach tu, sach thu
va cuu » va chu, va huu
va cau » van cau, va cac, va dau
x hoi » xa hoi, o hoi, x ho

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 ty)) nang x hoi. bieu hien hanh xuc may tinh ((va cuu) OR (va cau)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sach ty)) nang x hoi. bieu hien hanh xuc may tinh ((va cuu) OR (va cau)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) or (sach ty)) nang x hoi. bieu hien hanh xuc may tinh ((va cuu) OR (va cau)) tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) or (sach ty)) nang x hoi. bieu hien hanh xuc may tinh ((va cuu) OR (va cau)) tre*.