Perhaps you should try some spelling variations:
thanh toan » thanh hoa, thanh san, tinh toan
thong cong » trong cong, tong cong, thong thong
hien sach » dien sach, kien sach, thien hach
thanh van » thanh san, thanh phan, thanh nhan
cong van » cong vang, cong san, song van
hang ca » hang va, hang tai, hang dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien sach - hanh ((hang ca) or (nang cao)) thong cong van ((thanh van) or (thanh toan))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien sach - hanh ((hang ca) OR (nang cao)) thong cong van ((thanh van) OR (thanh toan)).
• Adding a wildcard symbol may retrieve word variants: hoc hien sach - hanh ((hang ca) or (nang cao)) thong cong van ((thanh van) or (thanh toan))*.