Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hoc thiet » hoc thieu, hoc thuyet, hoc hien
thiet anh » thien anh, thuyet anh, thien danh
trang va » tran van
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thiet anh - thanh ((trang va) OR (hang va)) nhung cong dan toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thiet anh - thanh ((trang va) OR (hang va)) nhung cong dan toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc thiet anh - thanh ((trang va) OR (hang va)) nhung cong dan toan cao*.