Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
anh nuoc » anh quoc, anh ngoc, anh buoc
hanh vai » hanh vi, hanh tai, hanh van
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hanh va » hang va, hanh vi
ca viet » va viet, co viet, hoa viet

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 ky nang xa hoi. ((lieu dien) or (hieu hien)) anh nuoc va ((hanh vai) OR (hanh va)) ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. ((lieu dien) OR (hieu hien)) anh nuoc va ((hanh vai) OR (hanh va)) ca viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. ((lieu dien) or (hieu hien)) anh nuoc va ((hanh vai) OR (hanh va)) ca viet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. ((lieu dien) or (hieu hien)) anh nuoc va ((hanh vai) OR (hanh va)) ca viet*.