Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
dang xay » dang van, van xay
hieu van » hieu va, thien van, lieu va
xay cho » day cho, cay cho, xay chen
van cau » van dau, van hau, van chat
truc va » thuc va, thuc vat, trung va
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
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 thu) or (sach y)) dang xay cho. hieu van cau truc va hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach thu) OR (sach y)) dang xay cho. hieu van cau truc va hanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: te ((sach thu) or (sach y)) dang xay cho. hieu van cau truc va hanh di cua tre*.