Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
nhung cong » dung cong, hang cong, nhung don
thanh toan » thanh hoa, tinh toan
hien sach » dien sach, kien sach, thien hach
hanh tram » hanh tam, hanh trang, thanh tran
tram van » tran van, tam van, trang van

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 tram van ((nhung cong) OR (thong cong)) ((thanh toan) or (thanh san)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien sach - hanh tram van ((nhung cong) OR (thong cong)) ((thanh toan) OR (thanh san)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien sach - hanh tram van ((nhung cong) OR (thong cong)) ((thanh toan) or (thanh san)) cao".
• Adding a wildcard symbol may retrieve word variants: hoc hien sach - hanh tram van ((nhung cong) OR (thong cong)) ((thanh toan) or (thanh san)) cao*.