Perhaps you should try some spelling variations:
truong phuong » truong chung, truong trung, dung phuong
phuong linh » phuong binh, phuong trinh, cuong linh
hien xanh » hien nhanh, chieu xanh, hien khanh
hien hanh » dieu hanh
tranh cac » trinh cac, thanh cac, tranh chap
tranh cai » trinh cai, tranh chap, tranh giai
linh toan » tinh toan, hinh toan, minh toan
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 hanh)) - canh ((tranh cac) OR (tranh cai)) truong phuong linh toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien xanh) OR (hien hanh)) - canh ((tranh cac) OR (tranh cai)) truong phuong linh toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien xanh) or (hien hanh)) - canh ((tranh cac) OR (tranh cai)) truong phuong linh toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) or (hien hanh)) - canh ((tranh cac) OR (tranh cai)) truong phuong linh toan cau*.