Perhaps you should try some spelling variations:
vat danh » va danh, van danh, luat danh
nam thuc » nam thuoc, am thuc, nam thu
hieu van » thien van, lieu va, hieu ve
sach thu » sach thue, sach thieu, sach tham
lang xa » lang ha, dang xay, lang van
sach ty » sach y, sach tu, xach tay
hieu va » lieu va, hieu qua
danh va » doanh va, hanh va, anh va
cuu tre » cua tre, cau tren, cau treo
va cuu » va cau, va chu, va huu

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc ((sach ty) or (sach thu)) lang xa hoi. ((hieu van) OR (hieu va)) nam thuc vat danh va cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach ty) OR (sach thu)) lang xa hoi. ((hieu van) OR (hieu va)) nam thuc vat danh va cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach ty) or (sach thu)) lang xa hoi. ((hieu van) OR (hieu va)) nam thuc vat danh va cuu tre".
• Adding a wildcard symbol may retrieve word variants: toc ((sach ty) or (sach thu)) lang xa hoi. ((hieu van) OR (hieu va)) nam thuc vat danh va cuu tre*.