Perhaps you should try some spelling variations:
phuong doan » phuong loan, phuong hoang, huong dan
phuong dan » phuong danh, huong dan, phuong lan
hien xanh » hien hanh, hien nhanh, chieu xanh
hanh nang » ganh nang, hanh mang, hanh trang
anh nang » ganh nang, anh bang, anh dang
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 - ((hanh nang) or (anh nang)) va nhung ((phuong dan) OR (phuong doan)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - ((hanh nang) OR (anh nang)) va nhung ((phuong dan) OR (phuong doan)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien xanh - ((hanh nang) or (anh nang)) va nhung ((phuong dan) OR (phuong doan)) toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - ((hanh nang) or (anh nang)) va nhung ((phuong dan) OR (phuong doan)) toan cau*.