Perhaps you should try some spelling variations:
trien cong » thien cong
tran hoang » tran hong, quan hoang, tran quang
thuong han » thuong mai, thuong va, thuong gap
doi chieu » doi chi, mot chieu, ho chieu
doc hieu » toc thieu, hoc thieu, hoc hien
han phan » than phan, hanh phan, phan phan
phan dau » phan tu, hang dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doi chieu) or (doc hieu)) sach - thanh cong ((trien cong) or (tran hoang)) thuong han phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (doc hieu)) sach - thanh cong ((trien cong) OR (tran hoang)) thuong han phan dau.
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (doc hieu)) sach - thanh cong ((trien cong) or (tran hoang)) thuong han phan dau*.