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

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 ((trung 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 ((trung long) OR (trong long)) tinh toan ban*.