Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
lang xa » lang ha, dang xay, lang van
long ha » dong ha, cong ha, dong hoa
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
ve cam » ve cham, ve cac, va cam
cam tu » cam thu, nam tu, dam tu
vi cua » vai cua
di cua » dai cua, doi cua, de cua

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 y ((lang xa) or (long ha)) hoi. hieu ve cam tu va hanh ((vi cua) or (di cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y ((lang xa) OR (long ha)) hoi. hieu ve cam tu va hanh ((vi cua) OR (di cua)) tre.
• Adding a wildcard symbol may retrieve word variants: toc sach y ((lang xa) or (long ha)) hoi. hieu ve cam tu va hanh ((vi cua) or (di cua)) tre*.