Perhaps you should try some spelling variations:
"ki nang quang van hien so" » "ki nang quan van hien so", "ki dang quang van hien so", "ki hang quang van hien so", "ki nang quang ban hien so", "ki nang quang uan hien so", "ki nang quang van hieu so", "ki nang quang van tien so", "ky nang quang van hien so", "ki nang quang van khien so", "ki nang quang van bien so"
"trinh dung quang dac diem soat" » "trinh dang quang dac diem soat", "trinh dung quan dac diem soat", "trinh luong quang dac diem soat", "trinh dung quang dai diem soat", "trinh dung quang dam diem soat", "trinh dung quang dac kiem soat", "trinh dung quang dac diem sai", "trinh dung quang dac dien hoat"

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("ki nang quang van hien so") OR ("trinh dung quang dac diem soat"))~.
• Removing quotes may allow a broader search: (( ki nang quang van hien so ) or ( trinh dung quang dac diem soat ))~.
• Adding a wildcard symbol may retrieve word variants: (("ki nang quang van hien so") or ("trinh dung quang dac diem soat"))*.