Perhaps you should try some spelling variations:
dieu cuu » dinh cuu, dien cuc, dieu can
dieu cua » dieu tra
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
cac tuc » cac toc, cac tu, cac tac
va hang » van hang, va nang, va lang
ve cac » va cac, vien cac
tuc va » thuc va, truc va, tuc xa

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

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