Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
su triet » su viet, su tien, ve triet
dang xay » dang van, van xay
dinh vai » dinh van, dinh vi, dinh va
hien cac » thien cac, vien cac, hieu cac
va dinh » van dinh, va kinh, va tinh
cua tre » cua te, cuu tre, cua triet
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
cac lao » ca lao, cac loai, cac giao
lao va » tao va, cao va, bao 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 ((nang x) or (dang xay)) hoi. hieu hien cac lao va dinh vai ((cua tre) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang x) OR (dang xay)) hoi. hieu hien cac lao va dinh vai ((cua tre) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang x) or (dang xay)) hoi. hieu hien cac lao va dinh vai ((cua tre) or (su triet))*.