Perhaps you should try some spelling variations:
cau thuc » cau truc, can thuc, cau phuc
cuu thuc » cuu tac
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va thanh, va danh
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
vi cua » vai cua
di cua » dai cua, doi cua, de cua

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: tu sach v nang xa hoi. lieu va ((cau thuc) OR (cuu thuc)) va hanh ((vi cua) OR (di cua)) tre~.
• Adding a wildcard symbol may retrieve word variants: tu sach v nang xa hoi. lieu va ((cau thuc) or (cuu thuc)) va hanh ((vi cua) or (di cua)) tre*.