Perhaps you should try some spelling variations:
sang thao » sang tao, sang than, rang thao
thao khoa » thai khoa, toan khoa, pham khoa
sach thu » sach thue, sach thieu, sach tham
danh va » doanh va, hanh va, anh va
va danh » va dinh, va dan, va hanh
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
sach ty » sach y, sach tu, xach tay
xuc va » duc va, tuc va, luc va
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu ((sach ty) or (sach thu)) sang thao khoa. ((hieu ve) or (lieu va)) cam xuc va danh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu ((sach ty) OR (sach thu)) sang thao khoa. ((hieu ve) OR (lieu va)) cam xuc va danh va cua tre.
• Adding a wildcard symbol may retrieve word variants: vu ((sach ty) or (sach thu)) sang thao khoa. ((hieu ve) or (lieu va)) cam xuc va danh va cua tre*.