Perhaps you should try some spelling variations:
lang van » tang van, hoang van, giang van
dang van » hoang van, hang va
sach tay » xach tay, sach hay, sach nay
tu sach » thu sach, su sach, te sach
va danh » va dinh, va dan, dia danh
vai cua » dai cua, hai cua, lai cua
qua cau » quan cau, qua cac, qua ca
va hanh » van hanh, va thanh, ban hanh
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: tu sach tay ((lang van) or (dang van)) hoi. hieu qua cau truc ((va hanh) OR (va danh)) vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tay ((lang van) OR (dang van)) hoi. hieu qua cau truc ((va hanh) OR (va danh)) vai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach tay ((lang van) or (dang van)) hoi. hieu qua cau truc ((va hanh) OR (va danh)) vai cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach tay ((lang van) or (dang van)) hoi. hieu qua cau truc ((va hanh) OR (va danh)) vai cua te*.