Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
thong dong » thong duong, thuong dong, thong cong
hieu lang » chieu sang, hieu quang, nhieu tang
tranh va » tranh van, trang va, trinh va
tran van » luan van
dong van » duong van, dang van, dong von
van toan » van tuan, van tan, van thanh
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((hieu nganh) or (hieu lang)) - canh ((tranh va) or (tran van)) thong dong van toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((hieu nganh) OR (hieu lang)) - canh ((tranh va) OR (tran van)) thong dong van toan ban.
• Adding a wildcard symbol may retrieve word variants: theo ((hieu nganh) or (hieu lang)) - canh ((tranh va) or (tran van)) thong dong van toan ban*.