Perhaps you should try some spelling variations:
thanh trung » thanh tung
dung phuong » dung thuong, bang phuong, dung chung
phuong dan » phuong danh, phuong doan, huong dan
doi chieu » doi chi, ho chieu, mot chieu
trung tan » trung tuan, trung tran, trung tang
doc hieu » toc thieu, hoc thieu, hoc hien
tan dung » tran dung, tin dung, van dung
toan cau » toan cao, toan ban, toan tai
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doi chieu) OR (doc hieu)) sach - thanh trung tan dung phuong dan ((toan cau) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (doc hieu)) sach - thanh trung tan dung phuong dan ((toan cau) OR (toan tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) OR (doc hieu)) sach - thanh trung tan dung phuong dan ((toan cau) or (toan tap))".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) OR (doc hieu)) sach - thanh trung tan dung phuong dan ((toan cau) or (toan tap))*.