Perhaps you should try some spelling variations:
thanh cac » hanh cac, thanh bac, tranh cac
nang van » dang van, lang van, nong van
tang van » dang van, hoang van, trong van
thanh ca » thanh cha, thanh ha, thanh va
cua tre » cua te, cuu tre, cua triet
cau luc » cau truc, cau phuc
hieu ve » hieu va, hieu van
luc va » duc va, tuc va, loc va
sac ky » cac ky, sai ky
ve cau » ke cau, va cau, ve cac
va sac » va cac, va suc, va san

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

• Performing a fuzzy search may retrieve terms with similar spellings: va sac ky ((nang van) OR (tang van)) hoi. hieu ve cau luc va ((thanh ca) or (thanh cac)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: va sac ky ((nang van) OR (tang van)) hoi. hieu ve cau luc va ((thanh ca) OR (thanh cac)) cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "va sac ky ((nang van) OR (tang van)) hoi. hieu ve cau luc va ((thanh ca) or (thanh cac)) cua tre*".