Perhaps you should try some spelling variations:
cau thuc » cau truc, cuu thuc, can thuc
vat danh » va danh, van danh, luat danh
sach ty » sach y, sach thu, xach tay
sach tu » sach thu, cach tu, sach uu
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
danh va » doanh va, hanh va, anh va
cua tre » cua te, cuu tre, cua triet
ve cau » ke cau, va cau, ve cac
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: tu ((sach ty) or (sach tu)) nang xa hoi. hieu ve cau thuc vat danh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach tu)) nang xa hoi. hieu ve cau thuc vat danh va cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach tu)) nang xa hoi. hieu ve cau thuc vat danh va cua tre*.