Perhaps you should try some spelling variations:
theo chieu » theo tieu, theo chu, thi chieu
thanh dung » thanh duong, thanh tung, thanh hung
nang cong » nang song, dang cong, bang cong
ho chieu » hoc thieu, doi chieu, mot chieu
dung van » duong van, dung va, dang van
van nang » van quang, van ban, van dong
cong tan » cong tac, cong san, cong thanh
tran tap » toan tap, tran tuan, trang tai
tran tan » tran tuan, tran van, tran thanh

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: ((ho chieu) OR (theo chieu)) sach - thanh dung van nang cong tan ((tran tap) OR (tran tan))~.
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (theo chieu)) sach - thanh dung van nang cong tan ((tran tap) or (tran tan))*.