Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
cac duc » cac du, cao duc, cac dac
hai cua » thai cua, dai cua, hoi cua
vai cua » dai cua, lai cua, bai cua
duc van » duc va, duc tan, duc manh
hieu va » lieu va, hieu qua
sach ly » sach y, sach lo, sach ty
nang xa » lang xa, nang ma, mang xa

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