Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
nhung cong » dung cong, thong cong, hang cong
hoc thiet » hoc thieu, hoc thuyet, hoc hien
hanh hang » thanh hang, hang hang, hanh han
cong manh » cong danh, duong manh, cong thanh
toan cau » toan ban, toan tap, toan tai
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 tach - hanh hang va nhung cong manh ((toan cau) or (((toan cao) or (van ban))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet tach - hanh hang va nhung cong manh ((toan cau) OR (((toan cao) OR (van ban)))).
• Adding a wildcard symbol may retrieve word variants: hoc thiet tach - hanh hang va nhung cong manh ((toan cau) or (((toan cao) or (van ban))))*.