Perhaps you should try some spelling variations:
than dieu » nhan dieu, han dieu, thuat dieu
thuc van » thuc dan, thuc va, thuc hanh
dieu tra » dieu tri, kiem tra, dieu cua
te sach » toc sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
tra tre » tran tren, tran tri, tran tro
va cau » van cau, va cac, va cao
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 xa hoi. hieu ((va cau) OR (va dau)) ((thuc van) or (thuc vat)) than dieu tra tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang xa hoi. hieu ((va cau) OR (va dau)) ((thuc van) OR (thuc vat)) than dieu tra tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang xa hoi. hieu ((va cau) OR (va dau)) ((thuc van) or (thuc vat)) than dieu tra tre*".