Perhaps you should try some spelling variations:
cau thuc » cau truc, cuu thuc, can thuc
via cua » gia cua, gian cua, giau cua
vat anh » van anh, sat anh, dat anh
sach ty » sach y, sach thu, xach tay
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
sach tu » sach thu, cach tu, sach uu
ve cau » ke cau, va cau, ve cac
va cua » va chua, ca cua, ma 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 anh ((va cua) OR (via 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 anh ((va cua) OR (via cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) or (sach tu)) nang xa hoi. hieu ve cau thuc vat anh ((va cua) OR (via cua)) tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach tu)) nang xa hoi. hieu ve cau thuc vat anh ((va cua) OR (via cua)) tre*.