Perhaps you should try some spelling variations:
thien van » thi van
cau treo » cau theo, cau tren, cau triet
nam thuc » nam thuoc, am thuc, nam thu
sach van » sach han, sach va, bach van
tinh di » tinh doi, trinh di, tinh da
va tinh » may tinh
thuc va » thuc vat, thuc dan, thuc day
te sach » toc sach
nang ma » tang ma, sang ma, nang cao
mang xa » lang xa, mang may, dang xay
hieu ve » hieu va, hieu van
di cau » da cau, diem cau

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 van ((mang xa) or (nang ma)) hoi. ((hieu ve) or (thien van)) nam thuc va tinh di cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach van ((mang xa) OR (nang ma)) hoi. ((hieu ve) OR (thien van)) nam thuc va tinh di cau treo.
• Adding a wildcard symbol may retrieve word variants: te sach van ((mang xa) or (nang ma)) hoi. ((hieu ve) or (thien van)) nam thuc va tinh di cau treo*.