Perhaps you should try some spelling variations:
hieu quan » hieu qua, lieu quan, thien quan
nang cong » nang song, dang cong, bang cong
thang va » hang va, trang va, thanh va
thong va » thong cua, truong va, thong qua
cong van » cong vang, cong san, song van
van chat » cao chat
chat ban » nhat ban, chat ran, cua ban
ho hieu » ho chieu, hoi hieu, nho hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho hieu quan - hanh ((thang va) OR (thong va)) nang cong van chat ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu quan - hanh ((thang va) OR (thong va)) nang cong van chat ban".
• Adding a wildcard symbol may retrieve word variants: ho hieu quan - hanh ((thang va) OR (thong va)) nang cong van chat ban*.