Perhaps you should try some spelling variations:
chieu chien » thien chien
bich ngoc » bich nga, dinh ngoc
hieu hien » bieu hien, dieu hien, dieu khien
va danh » va dinh, va hanh, dia danh
sach ky » sac ky, sach y, sach ty
co sach » bo sach, cuon sach, hoc sach
nang xa » nang x, lang xa, nang ma
va dan » ca dan, va dao, va dau
vi cua » vai cua, di cua
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: co sach ky nang xa hoi. ((hieu hien) OR (chieu chien)) bich ngoc ((va danh) or (va dan)) vi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co sach ky nang xa hoi. ((hieu hien) OR (chieu chien)) bich ngoc ((va danh) OR (va dan)) vi cua tu*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "co sach ky nang xa hoi. ((hieu hien) OR (chieu chien)) bich ngoc ((va danh) or (va dan)) vi cua tu*".