Perhaps you should try some spelling variations:
hieu hieu » hien hieu, hieu hien, thien hieu
hieu cac » hieu luc, hieu va, hieu van
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
sach ky » sac ky, sach y, sach ty
su sach » so sach, vu sach
cua tuc » cua duc, cua thuoc, luat tuc
nang xa » lang xa, nang ma, mang xa
cac co » cac cong
co van » cao van, vo van, so van
cua tu » cua su, cua cu, cua te

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