Perhaps you should try some spelling variations:
thanh dong » thanh duong, thanh cong, nhanh dong
thang long » thanh cong
hieu xanh » chieu xanh, hieu manh, hieu nganh
hanh dong » anh dong, ha dong
hang nong » han tong
doc hieu » toc thieu, hoc thieu, hoc hien
bai tai » bai tap, ban tai, dai tai
tai ban » tai san, tai ngan, tai benh

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu xanh - ((thanh dong) or (hanh dong)) cua ((hang nong) OR (thang long)) bai tai ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - ((thanh dong) OR (hanh dong)) cua ((hang nong) OR (thang long)) bai tai ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu xanh - ((thanh dong) or (hanh dong)) cua ((hang nong) OR (thang long)) bai tai ban".
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - ((thanh dong) or (hanh dong)) cua ((hang nong) OR (thang long)) bai tai ban*.