Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hanh sua » hinh su, hanh va, hanh tu
va hanh » van hanh, va thanh, va danh
van cau » van dau, van hau, van chat
su sach » so sach, vu sach
van cam » van nam, van lam, van dam
nang xa » lang xa, nang ma, mang xa
loc va » hoc va, luc va
sua va » suat va, vua va, xua 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 y ((nang xa) or (nang x)) hoi. hieu ((van cam) OR (van cau)) loc va hanh sua va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((nang xa) OR (nang x)) hoi. hieu ((van cam) OR (van cau)) loc va hanh sua va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y ((nang xa) or (nang x)) hoi. hieu ((van cam) OR (van cau)) loc va hanh sua va triet".
• Adding a wildcard symbol may retrieve word variants: su sach y ((nang xa) or (nang x)) hoi. hieu ((van cam) OR (van cau)) loc va hanh sua va triet*.