Perhaps you should try some spelling variations:
thien danh » thien anh, thien dang, thien thanh
nhung cong » dung cong, thong cong, hang cong
hoc thien » hoc hien, hoc thieu, hoc thiet
hach toan » thanh toan, manh toan
trang va » hang va
tran van » luan van
tac toan » tap toan, tam toan, tich toan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thien danh - thanh ((trang va) OR (tran van)) nhung cong ((tac toan) or (hach toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thien danh - thanh ((trang va) OR (tran van)) nhung cong ((tac toan) OR (hach toan)) cao*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thien danh - thanh ((trang va) OR (tran van)) nhung cong ((tac toan) or (hach toan)) cao*".