Perhaps you should try some spelling variations:
sach thue » sach thu, sach thieu, sach tham
hieu van » hieu va, thien van, lieu va
dang xay » dang van, van xay
danh di » danh du, xanh di, danh dien
truc va » thuc va, trung va
van cau » van dau, van hau, van chat
xay cho » day cho, cay cho, xay chen
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de 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 thue) or (sach y)) dang xay cho. hieu van cau ((truc va) OR (thuc vat)) danh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach thue) OR (sach y)) dang xay cho. hieu van cau ((truc va) OR (thuc vat)) danh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach thue) or (sach y)) dang xay cho. hieu van cau ((truc va) OR (thuc vat)) danh di cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach thue) or (sach y)) dang xay cho. hieu van cau ((truc va) OR (thuc vat)) danh di cua tre*.