Perhaps you should try some spelling variations:
thanh toan » thanh hoa, thanh san, tinh toan
nhanh lang » nhanh quang, nhanh thang, nhan dang
thong cong » trong cong, tong cong, thong thong
doi chieu » doi chi, ho chieu, mot chieu
doc hieu » toc thieu, hoc thieu, hoc hien
va thong » va thuong, va phuong, he thong
cong van » cong vang, cong san, song van
van tuan » van quan, van ban, anh tuan
tuan tai » toan tai, quan tai, tan tai

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 toan) or (nhanh lang)) va thong cong van tuan tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (doc hieu)) sach - ((thanh toan) OR (nhanh lang)) va thong cong van tuan tai.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) OR (doc hieu)) sach - ((thanh toan) or (nhanh lang)) va thong cong van tuan tai".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) OR (doc hieu)) sach - ((thanh toan) or (nhanh lang)) va thong cong van tuan tai*.