Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
cau tren » cu tren, dau tren, ca tren
hanh vii » hanh voi, hanh va, hanh noi
lang cac » bang cac, hang cac, dang cac
cac khoi » cac thoi, cac khoan, cach thoi
thuc va » thuc vat, thuc dan, thuc day
sach ky » sac ky, sach ty, sach kem
hieu ve » hieu va, hieu van
ve nham » ve nha, ve cham

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 ky) OR (sach y)) lang cac khoi. hieu ve nham thuc va ((hanh vii) or (hanh vi)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach y)) lang cac khoi. hieu ve nham thuc va ((hanh vii) OR (hanh vi)) cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) OR (sach y)) lang cac khoi. hieu ve nham thuc va ((hanh vii) or (hanh vi)) cau tren".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) OR (sach y)) lang cac khoi. hieu ve nham thuc va ((hanh vii) or (hanh vi)) cau tren*.