Perhaps you should try some spelling variations:
hien xanh » hien hanh, hien nhanh, chieu xanh
tinh dinh » trinh dinh, tinh ninh, tinh binh
nhung don » nhung van
hang cong » dang cong, hang nong, bang cong
tran chau » tranh chap, tran huu
dinh cuu » dinh chi
nhung bo » nhung bi, nhung bai, trung bo

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - tinh dinh cuu ((((nhung don) OR (nhung bo))) OR (hang cong)) tan tran chau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien xanh - tinh dinh cuu ((((nhung don) OR (nhung bo))) or (hang cong)) tan tran chau~".
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - tinh dinh cuu ((((nhung don) OR (nhung bo))) or (hang cong)) tan tran chau*.