Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
lang van » dang van, tang van, hoang van
te sach » toc sach
luu tre » luu tru, cuu tre
soc van » hoc van, oc van, sac van
vu cham » va cham, vu kham, tu cham
sach ky » sac ky, sach y, sach ty
hieu vu » hieu va, hieu ve, hieu su
mang xa » lang xa, mang may, dang xay
luy tre » luyen tre

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 ((mang xa) or (lang van)) hoi. hieu vu cham soc van hanh vi ((luu tre) OR (luy tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((mang xa) OR (lang van)) hoi. hieu vu cham soc van hanh vi ((luu tre) OR (luy tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky ((mang xa) or (lang van)) hoi. hieu vu cham soc van hanh vi ((luu tre) OR (luy tre))*".