Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
cau thuc » cau truc, cuu thuc, can thuc
thanh va » thanh van, hanh va, thanh ha
va thanh » gia thanh, ban thanh, va tinh
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
va cua » va chua, via cua, ca cua
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach y ((nang xa) or (nang ma)) hoi. ((hieu ve) or (lieu va)) cau thuc va thanh va cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach y ((nang xa) OR (nang ma)) hoi. ((hieu ve) OR (lieu va)) cau thuc va thanh va cua tu.
• Adding a wildcard symbol may retrieve word variants: thuat sach y ((nang xa) or (nang ma)) hoi. ((hieu ve) or (lieu va)) cau thuc va thanh va cua tu*.