Perhaps you should try some spelling variations:
dau tren » dau tien, dat tren, dau tieng
thanh vi » hanh vi, thanh va, thanh ve
lang van » dang van, tang van, hoang van
duc gia » quoc gia
sach ty » sach tu, sach thu, xach tay
van hoi » van hoa, van hoc, van hoe
ve bao » te bao, va bao
vi dau » vi dai, va dau, bi dau
ve cao » va cao, ve cac, ve co

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach ty) OR (sach y)) lang van hoi. hieu ((ve cao) or (ve bao)) duc gia thanh vi dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ty) OR (sach y)) lang van hoi. hieu ((ve cao) OR (ve bao)) duc gia thanh vi dau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ty) OR (sach y)) lang van hoi. hieu ((ve cao) or (ve bao)) duc gia thanh vi dau tren".
• Adding a wildcard symbol may retrieve word variants: te ((sach ty) OR (sach y)) lang van hoi. hieu ((ve cao) or (ve bao)) duc gia thanh vi dau tren*.