Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cac luc » cau luc, coc luc, cac nuoc
hai cua » thai cua, dai cua, hoi cua
vai cua » dai cua, lai cua, bai cua
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va, hieu van
nang xa » lang xa, nang ma, mang xa
luc va » duc va, tuc va, loc va
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y ((nang xa) or (nang x)) hoi. hieu ve cac luc va hanh ((vai cua) OR (hai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y ((nang xa) OR (nang x)) hoi. hieu ve cac luc va hanh ((vai cua) OR (hai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y ((nang xa) or (nang x)) hoi. hieu ve cac luc va hanh ((vai cua) OR (hai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: thu sach y ((nang xa) or (nang x)) hoi. hieu ve cac luc va hanh ((vai cua) OR (hai cua)) tre*.