Perhaps you should try some spelling variations:
canh giac » danh gia, anh giao, canh tac
cau tren » cu tren, dau tren, ca tren
anh giau » anh giao, anh giang, danh giao
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
xac ky » cac ky, bac ky
cac so » cac co, cac bo, cac ho
so van » su van, vo van
sac ky » cac ky, sai ky
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((xac ky) or (sac ky)) lang xa hoi. hieu ve cac so van ((anh giau) or (canh giac)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((xac ky) OR (sac ky)) lang xa hoi. hieu ve cac so van ((anh giau) OR (canh giac)) cau tren.
• Adding a wildcard symbol may retrieve word variants: thu ((xac ky) or (sac ky)) lang xa hoi. hieu ve cac so van ((anh giau) or (canh giac)) cau tren*.