Perhaps you should try some spelling variations:
dieu can » dieu hanh, tiep can, dieu cua
sach thu » sach thue, sach thieu, sach tham
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
sach ty » sach y, sach tu, xach tay
va hanh » van hanh, va thanh, va danh
tam tu » nam tu, cam tu, dam tu
di cau » da cau, diem cau
va tam » van tam, va tham, va tac

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc ((sach ty) OR (sach thu)) nang xa hoi. hieu va tam tu va hanh ((di cau) or (dieu can)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach ty) OR (sach thu)) nang xa hoi. hieu va tam tu va hanh ((di cau) OR (dieu can)) tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach ty) OR (sach thu)) nang xa hoi. hieu va tam tu va hanh ((di cau) or (dieu can)) tren".
• Adding a wildcard symbol may retrieve word variants: toc ((sach ty) OR (sach thu)) nang xa hoi. hieu va tam tu va hanh ((di cau) or (dieu can)) tren*.