Perhaps you should try some spelling variations:
thiet danh » thien danh, thien anh, thien dang
thanh tung » thanh cong
hoc thiet » hoc thieu, hoc thuyet, hoc hien
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan ban » van ban
va nang » van nang, da nang, kha nang

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 danh - thanh tung ((va nang) OR (cam nang)) cong dan toan ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thiet danh - thanh tung ((va nang) OR (cam nang)) cong dan toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc thiet danh - thanh tung ((va nang) OR (cam nang)) cong dan toan ban*.