Perhaps you should try some spelling variations:
dieu tra » dieu tri, kiem tra
van hanh » van thanh, ban hanh, van anh
phuc van » thuc van, phuc va, chuc van
te sach » toc sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
va cau » van cau, va cac, va cao
ma hoi » mai hoi, xa hoi, ma hoa
va dau » va dao

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 nang ma hoi. hieu ((va cau) or (va dau)) phuc van hanh ((dieu cua) OR (dieu tra)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ma hoi. hieu ((va cau) OR (va dau)) phuc van hanh ((dieu cua) OR (dieu tra)) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ma hoi. hieu ((va cau) or (va dau)) phuc van hanh ((dieu cua) OR (dieu tra)) tre*".