Perhaps you should try some spelling variations:
thanh trung » thanh tung
hanh trinh » canh tranh, hanh chinh
tong thong » thong thong, dong thong, thong thuong
cong thong » cong thuong, cong trong, dong thong
hieu lang » chieu sang, hieu quang, nhieu tang
than tuan » thanh tuan, tran tuan, thanh xuan
hoc hieu » hoc thieu, hoc hien, doc hieu
tuan ban » tuan bang, toan ban, luan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hieu lang - ((hanh trinh) or (thanh trung)) cua ((tong thong) OR (cong thong)) than tuan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu lang - ((hanh trinh) OR (thanh trung)) cua ((tong thong) OR (cong thong)) than tuan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu lang - ((hanh trinh) or (thanh trung)) cua ((tong thong) OR (cong thong)) than tuan ban".
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - ((hanh trinh) or (thanh trung)) cua ((tong thong) OR (cong thong)) than tuan ban*.