Perhaps you should try some spelling variations:
thien van » thi van
cuu thuc » cuu tac
dang xay » dang van, van xay
thuc va » thuc vat, thuc dan, thuc day
van cuu » van cau, van chu, van cu
sach ty » sach tu, sach thu, xach tay
xay cho » day cho, cay cho, xay chen
va dan » ca dan, va dao, va dau
di cua » doi cua, de cua, do cua

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)) dang xay cho. thien van cuu thuc va dan ((di cua) OR (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ty) OR (sach y)) dang xay cho. thien van cuu thuc va dan ((di cua) OR (dai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ty) or (sach y)) dang xay cho. thien van cuu thuc va dan ((di cua) OR (dai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach ty) or (sach y)) dang xay cho. thien van cuu thuc va dan ((di cua) OR (dai cua)) tre*.