Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
thanh tung » thanh cong
ban chang » ban hang, san chang, han chang
doc hieu » toc thieu, hoc thieu, hoc hien
ban chan » dan chan, ban than, ban nhan
tung am » tung pham, tung dan, tung bay
am dung » am duong, lam dung, ap dung

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: ((theo chieu) OR (doc hieu)) sach - thanh tung am dung trong ((ban chan) OR (ban chang)) cau~.
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) or (doc hieu)) sach - thanh tung am dung trong ((ban chan) or (ban chang)) cau*.