Perhaps you should try some spelling variations:
tieu danh » dieu danh, tiep danh, thien danh
tang vatn » tang van, dang van, tan van
nang cong » nang song, dang cong, bang cong
tang vat » tang van, dang vat, bang vat
cong san » cong tac
toan cau » toan cao, toan tap, toan tai
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo tieu danh - hanh ((tang vat) or (tang vatn)) nang cong san ((toan cau) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu danh - hanh ((tang vat) OR (tang vatn)) nang cong san ((toan cau) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: theo tieu danh - hanh ((tang vat) or (tang vatn)) nang cong san ((toan cau) or (toan ban))*.