Perhaps you should try some spelling variations:
sach thue » sach thu, sach thieu, sach tham
thu sach » tu sach, thuat sach, thuoc sach
duc manh » suc manh, duc anh, duc minh
nang xa » lang xa, nang ma, mang xa
duc van » duc va, duc tan, duc phan
hanh va » hang va, hanh vi
chu tre » cho tre, chu tri, cuu tre
va cam » va cham, va cac, va cao
va chu » va che, va cau, va chi

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