Perhaps you should try some spelling variations:
sach thue » sach thu, sach thieu, sach tham
cua viet » ca viet, hoa viet, cua vat
van hanh » van thanh, ban hanh, van anh
thuc van » thuc vat, thuc dan, thuc va
cau thuc » cau truc, cuu thuc, can thuc
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
hanh va » hang va, hanh vi
sai ky » sac ky
va cau » van cau, va cac, va dau
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 thue) or (sach y))) or (sai ky)) lang xa hoi. hieu va cau thuc van hanh va cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((((sach thue) OR (sach y))) OR (sai ky)) lang xa hoi. hieu va cau thuc van hanh va cua viet.
• Adding a wildcard symbol may retrieve word variants: tu ((((sach thue) or (sach y))) or (sai ky)) lang xa hoi. hieu va cau thuc van hanh va cua viet*.