Perhaps you should try some spelling variations:
su triet » su tien, ve triet
tinh doi » trinh doc, trinh do, tinh hoc
dang xay » dang van, van xay
su sach » so sach, vu sach
va tinh » may tinh
cac tuc » cac toc, cac tu, cac tac
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
su viet » so viet
tuc va » thuc va, truc va, tuc xa

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 (dang xay)) hoi. lieu va cac tuc va tinh doi ((su triet) or (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang xa) OR (dang xay)) hoi. lieu va cac tuc va tinh doi ((su triet) OR (su viet)).
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang xa) or (dang xay)) hoi. lieu va cac tuc va tinh doi ((su triet) or (su viet))*.