Perhaps you should try some spelling variations:
hoang hanh » hoang thanh, hoang anh, hoang xanh
hoang manh » hoang minh, hoang anh, hoang xanh
hieu xanh » chieu xanh, hieu nganh, dieu hanh
hieu manh » chieu xanh, hieu nganh, dieu hanh
manh toan » thanh toan, anh tuan, tinh toan
toan cao » toan ban, toan tap
va hang » van hang, va lang, va hanh
va nang » van nang, da nang, cam nang

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) OR (hieu manh)) - hoang hanh ((va hang) or (va nang)) hoang manh toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu xanh) OR (hieu manh)) - hoang hanh ((va hang) OR (va nang)) hoang manh toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu xanh) OR (hieu manh)) - hoang hanh ((va hang) or (va nang)) hoang manh toan cao".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu xanh) OR (hieu manh)) - hoang hanh ((va hang) or (va nang)) hoang manh toan cao*.