Perhaps you should try some spelling variations:
hien nhanh » hien hanh, thien thanh, tien thanh
thanh dong » thanh duong, thanh cong, nhanh dong
hien xanh » hien hanh, chieu xanh, hien khanh
hanh dong » anh dong, ha dong
trong van » trong cac
san dung » van dung, dan dung, tan dung
van toan » van tuan, van tan, van thanh
toan cau » 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 ((hien xanh) OR (hien nhanh)) - ((hanh dong) or (thanh dong)) san dung trong van toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien xanh) OR (hien nhanh)) - ((hanh dong) OR (thanh dong)) san dung trong van toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien xanh) OR (hien nhanh)) - ((hanh dong) or (thanh dong)) san dung trong van toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) OR (hien nhanh)) - ((hanh dong) or (thanh dong)) san dung trong van toan cau*.