Perhaps you should try some spelling variations:
sau cham » cau cham, sau chan, va cham
cua viet » hoa viet, cua vat, cua dieu
thu sach » tu sach, thuat sach, thuoc sach
van nang » van quang, van ban, van dong
hieu sau » hieu su, hieu suat, tieu su
dau cua » dai cua, day cua, cau cua
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
ca viet » va viet, co viet, hoa viet
soc va » hoc va, loc va, doc va
va dau » va dao

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (thu sach)) van nang xa hoi. hieu sau cham soc va dau cua ((cua viet) OR (ca viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (thu sach)) van nang xa hoi. hieu sau cham soc va dau cua ((cua viet) OR (ca viet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (thu sach)) van nang xa hoi. hieu sau cham soc va dau cua ((cua viet) OR (ca viet))*".