Perhaps you should try some spelling variations:
hieu thien » hieu hien, chieu chien, dieu khien
thien cac » hien cac, thien cau, thieu cac
vai cua » hai cua, lai cua, bai cua
va hanh » van hanh, va thanh, va danh
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
sach tu » sach thu, cach tu, sach ty
cac co » cac cong
co va » co ma, do va, so va

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 ky) or (sach tu)) nang xa hoi. hieu thien cac co va hanh ((vai cua) OR (dai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach tu)) nang xa hoi. hieu thien cac co va hanh ((vai cua) OR (dai cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) or (sach tu)) nang xa hoi. hieu thien cac co va hanh ((vai cua) OR (dai cua)) te".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (sach tu)) nang xa hoi. hieu thien cac co va hanh ((vai cua) OR (dai cua)) te*.