Perhaps you should try some spelling variations:
hien xanh » hien hanh, hien nhanh, chieu xanh
hanh tang » hanh trang, anh tang, hanh tung
hanh mang » nhanh mang, hanh trang, nhanh lang
luan nang » luan van, van nang, luan san
nang cong » nang song, dang cong, bang cong
dan toan » van toan, dan than, manh toan
van tuan » van quan, van ban, anh tuan

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 - ((hanh tang) or (hanh mang)) luan nang cong ((dan toan) or (van tuan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - ((hanh tang) OR (hanh mang)) luan nang cong ((dan toan) OR (van tuan)) cao.
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - ((hanh tang) or (hanh mang)) luan nang cong ((dan toan) or (van tuan)) cao*.