Perhaps you should try some spelling variations:
dieu tra » dieu tri, kiem tra
so sach » so sanh, bo sach, co sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
ve cac » va cac, vien cac
cac tu » cac thu, cach tu, cac du

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sach v nang xa hoi. hieu ve cac tu va hanh ((dieu cua) OR (dieu tra)) te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach v nang xa hoi. hieu ve cac tu va hanh ((dieu cua) OR (dieu tra)) te".
• Adding a wildcard symbol may retrieve word variants: so sach v nang xa hoi. hieu ve cac tu va hanh ((dieu cua) OR (dieu tra)) te*.