Perhaps you should try some spelling variations:
trinh thuong » trinh phuong, trinh huong, trinh truong
thuong han » thuong mai, thuong va, thuong gap
quang tang » quang thang, quang dang, quang tung
kiem soat » kiem toan
van kiem » van kien, van hien, tac kiem
van hieu » cao hieu
va kiem » van kien
han va » hang va, hanh va, nhan va

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( trinh thuong han va kiem soat ) or ( tinh quang tang ((van kiem) OR (van hieu)) toan ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( trinh thuong han va kiem soat ) OR ( tinh quang tang ((van kiem) OR (van hieu)) toan )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( trinh thuong han va kiem soat ) or ( tinh quang tang ((van kiem) OR (van hieu)) toan ))".
• Adding a wildcard symbol may retrieve word variants: (( trinh thuong han va kiem soat ) or ( tinh quang tang ((van kiem) OR (van hieu)) toan ))*.