Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
tang nguon » tang nguyen, dung nguon, bang ngon
hien hanh » dieu hanh
tranh cua » doanh cua, manh cua
nguon van » nguon von, nguoi van, nguyen van
cua tang » cua dang, cua hang, ca tang
van tuan » van quan, van ban, anh tuan
tuan tai » toan tai, quan tai, tan tai

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