Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
dinh cuu » dinh chi
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
va danh » va dinh, va dan, va hanh
va cam » va cham, va cac, va cao
cam tu » cam thu, nam tu, dam tu
di cuu » di cau, di cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach thieu ((nang x) OR (lang xa)) hoi. hieu va cam tu va danh ((di cuu) OR (dinh cuu)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach thieu ((nang x) or (lang xa)) hoi. hieu va cam tu va danh ((di cuu) OR (dinh cuu)) tre~".
• Adding a wildcard symbol may retrieve word variants: thuoc sach thieu ((nang x) or (lang xa)) hoi. hieu va cam tu va danh ((di cuu) OR (dinh cuu)) tre*.