Perhaps you should try some spelling variations:
truong long » trong long, trung long, truong cong
tranh cac » trinh cac, thanh cac, tranh cai
doc hieu » toc thieu, hoc thieu, hoc hien
long san » long span, luong san, cong san
than cau » toan cau, than cap, thanh chau
phan cau » phan dau, phan cac, phan tu
doi chi » doi khi

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) or (doi chi)) tinh - canh tranh cac truong long san ((than cau) or (phan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (doi chi)) tinh - canh tranh cac truong long san ((than cau) OR (phan cau)).
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (doi chi)) tinh - canh tranh cac truong long san ((than cau) or (phan cau))*.