Perhaps you should try some spelling variations:
sach kem » hanh kem
dan hanh » dang hanh, dan khanh, dan thanh
thuc dan » thuc hanh, hoc dan, thuc vat
hanh va » hang va, hanh vi
ca viet » va viet, co viet, hoa viet
he nam » ha nam, nghe nam
ve nam » va nam, le nam, te nam
x hoi » xa hoi, o hoi, x ho
va ca » va cac, va cao, va cai

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 kem) or (sach y)) nang x hoi. hieu ((ve nam) or (he nam)) thuc dan hanh va ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach kem) OR (sach y)) nang x hoi. hieu ((ve nam) OR (he nam)) thuc dan hanh va ca viet.
• Adding a wildcard symbol may retrieve word variants: tu ((sach kem) or (sach y)) nang x hoi. hieu ((ve nam) or (he nam)) thuc dan hanh va ca viet*.