Perhaps you should try some spelling variations:
nguyen tai » nguyen thai, nguyen thi, nguyen tac
chung thue » chung tu, hung thu, chung than
tai chung » tai hung, tai thung, thi chung
dung cong » dung trong
ban ke » ban kem, ban ve, ban le
mo ta » mo tai, co ta, mo te
mo va » do va, me va, so va

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

• Performing a fuzzy search may retrieve terms with similar spellings: nguyen tai chung thue đe co ban ke ((((mo ta) OR (mo va))) or (bo de)) dung cong~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nguyen tai chung thue đe co ban ke ((((mo ta) OR (mo va))) OR (bo de)) dung cong.
• The words AND, OR and NOT may confuse the search; try adding quotes: "nguyen tai chung thue đe co ban ke ((((mo ta) OR (mo va))) or (bo de)) dung cong".
• Adding a wildcard symbol may retrieve word variants: nguyen tai chung thue đe co ban ke ((((mo ta) OR (mo va))) or (bo de)) dung cong*.