Perhaps you should try some spelling variations:
dau tren » dau tien, dat tren, dau tieng
thanh vi » thanh va, thanh ve, nhanh vi
lang van » dang van, tang van, hoang van
duc gia » quoc gia
cau duc » cao duc, cau luc, chu duc
sach ty » sach y, sach thu, xach tay
sach tu » sach thu, cach tu, sach uu
hieu ve » hieu va, hieu van
ve cau » ke cau, va cau, ve cac

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