Perhaps you should try some spelling variations:
truong long » trung long, truong cong, truong dong
trong long » trong luong, trong cong, trong nong
hieu xanh » chieu xanh, hieu manh, hieu nganh
doc hieu » toc thieu, hoc thieu, hoc hien
mang cua » manh cua, dung cua, cong cua
toan ban » van ban
ban cua » ban quan

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 - hanh ((mang cua) OR (ban cua)) ((truong long) or (trong long)) tinh toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - hanh ((mang cua) OR (ban cua)) ((truong long) OR (trong long)) tinh toan ban*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu xanh - hanh ((mang cua) OR (ban cua)) ((truong long) or (trong long)) tinh toan ban*".