Perhaps you should try some spelling variations:
thien van » thi van
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang co » nang cao, nang doc, nang noi
van cau » van dau, van hau, van chat
toc xa » tuc xa, toc ta, hoc xa
vi cua » vai cua, di cua
cua tu » cua tuc, cua su, cua cu

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang x) OR (nang co)) hoi. thien van cau ((toc xa) OR (hoc ma)) hanh vi cua tu~.
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang x) or (nang co)) hoi. thien van cau ((toc xa) or (hoc ma)) hanh vi cua tu*.