Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
trong tang » trong trang, trong tan, trong dang
hoc thiet » hoc thieu, hoc thuyet, hoc hien
nhan dung » chan dung, nhan dang, ngan dung
luan dung » lan dung, luan dong, luan hung
tang van » dang van, hoang van, trong 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 thiet tach - nhan dung luan dung trong tang van ban~.
• Adding a wildcard symbol may retrieve word variants: hoc thiet tach - nhan dung luan dung trong tang van ban*.