Perhaps you should try some spelling variations:
sach tay » xach tay, sach hay, sach nay
lang van » tang van, hoang van, giang van
dang van » hoang van, hang va
tu sach » thu sach, su sach, te sach
qua cau » quan cau, qua cac, qua ca
truc va » thuc va, thuc vat, trung va
va hanh » van hanh, va thanh, va danh
vai cua » hai cua, lai cua, bai cua

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 ((vai cua) OR (dai 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 ((vai cua) OR (dai 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 ((vai cua) OR (dai 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 ((vai cua) OR (dai cua)) te*.