Perhaps you should try some spelling variations:
tay quang » tac quang, tai quang, tao quang
su triet » su viet, su tien, ve triet
sach tay » xach tay, sach hay, sach nay
quang xa » quan xa, quang ma, quang va
van manh » van minh, van anh, van hanh
va manh » va danh, va hanh, ha manh
tu sach » thu sach, su sach, te sach
ve cam » ve cham, ve cac, va cam
hai su » hai vu, lai su, hai so
va cao » va cac, va co, va dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach tay quang xa hoi. hieu ((ve cam) or (va cao)) xuc ((va manh) or (van manh)) hai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tay quang xa hoi. hieu ((ve cam) OR (va cao)) xuc ((va manh) OR (van manh)) hai su triet.
• Adding a wildcard symbol may retrieve word variants: tu sach tay quang xa hoi. hieu ((ve cam) or (va cao)) xuc ((va manh) or (van manh)) hai su triet*.