Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
nang xa » lang xa, nang ma, mang xa
hieu ve » hieu va, hieu van
va hanh » va thanh, va danh, ban hanh
ve cau » ke cau, va cau, ve cac
va cua » va chua, via cua, ca cua
cua te » cua tu

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