Perhaps you should try some spelling variations:
dieu hien » dieu khien, dieu kien, bieu hien
hien cac » thien cac, vien cac, hieu cac
hang vai » hang tai, hang vi, hang vat
hang hai » hoang hai, hang tai, thanh hai
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
cac dua » cach dua, cac qua, cac du
dua ban » dia ban, cua ban, qua ban
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, x ho

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 y nang x hoi. dieu hien cac dua ban ((((hang vai) or (hang hai))) or (hang va)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang x hoi. dieu hien cac dua ban ((((hang vai) OR (hang hai))) OR (hang va)) su triet.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x hoi. dieu hien cac dua ban ((((hang vai) or (hang hai))) or (hang va)) su triet*.