Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
hien xanh » hien hanh, hien nhanh, chieu xanh
nguon van » nguon von, nguoi van, nguyen van
cua tang » cua dang, cua hang, cua lang
van quan » van ban
quan tap » quan tai, quan lap, quan tam
ca tang » cao tang, ha tang, gia tang

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) or (chieu tinh)) - canh tranh ((cua tang) or (ca tang)) nguon van quan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien xanh) OR (chieu tinh)) - canh tranh ((cua tang) OR (ca tang)) nguon van quan tap.
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) or (chieu tinh)) - canh tranh ((cua tang) or (ca tang)) nguon van quan tap*.