Perhaps you should try some spelling variations:
thanh hoai » thanh hoa, thanh oai, thanh hoang
thanh hoi » thanh hoa, thanh loi, thanh moi
thanh hai » thanh phan, thanh hoa, thanh san
cua tre » cua te, cuu tre, cua triet
duc ban » duc tan, duc van, dua ban
cam duc » cam xuc, cao duc, pham duc
hieu ve » hieu va, hieu van
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
sai ky » sac ky
ve cam » ve cham, ve cac, va cam
su sai » su tai, su hai, su dai

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sai ky dang xa hoi. hieu ve cam duc ban ((thanh hoi) or (((thanh hoai) OR (thanh hai)))) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sai ky dang xa hoi. hieu ve cam duc ban ((thanh hoi) OR (((thanh hoai) OR (thanh hai)))) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sai ky dang xa hoi. hieu ve cam duc ban ((thanh hoi) or (((thanh hoai) OR (thanh hai)))) cua tre".
• Adding a wildcard symbol may retrieve word variants: su sai ky dang xa hoi. hieu ve cam duc ban ((thanh hoi) or (((thanh hoai) OR (thanh hai)))) cua tre*.