Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
sach thu » sach thue, sach thieu, sach tham
thuc dan » hoc dan, thuc vat
sach thi » sach tai, sach thieu, sach tham
hanh ve » hanh vi, hanh va, hanh kem
hieu ve » hieu va, hieu van
ve cua » le cua, de cua, te cua
ve nam » he nam, va nam, le nam
x hoi » xa hoi, o hoi, x ho

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 thi) OR (sach thu)) nang x hoi. hieu ve nam ((thuc dan) or (thuc hanh)) hanh ve cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach thi) OR (sach thu)) nang x hoi. hieu ve nam ((thuc dan) OR (thuc hanh)) hanh ve cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach thi) OR (sach thu)) nang x hoi. hieu ve nam ((thuc dan) or (thuc hanh)) hanh ve cua viet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach thi) OR (sach thu)) nang x hoi. hieu ve nam ((thuc dan) or (thuc hanh)) hanh ve cua viet*.