Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu san » hieu van, hieu sau, chieu sang
cau treo » cau theo, cau tren, cau triet
sach ky » sac ky, sach y, sach ty
danh di » danh du, danh dien, danh gia
xanh di » vanh dai, xanh tai
ca viet » va viet, co viet, hoa viet
x hoi » xa hoi, o hoi, x ho
pham » phan

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang x hoi. hieu san pham duc va ((danh di) OR (xanh di)) ((cau treo) or (ca viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang x hoi. hieu san pham duc va ((danh di) OR (xanh di)) ((cau treo) OR (ca viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang x hoi. hieu san pham duc va ((danh di) OR (xanh di)) ((cau treo) or (ca viet))".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang x hoi. hieu san pham duc va ((danh di) OR (xanh di)) ((cau treo) or (ca viet))*.