Perhaps you should try some spelling variations:
vanh dai » van dai, vanh tai, lanh dao
tang tai » hang tai, dung tai, sang tao
nang tai » hang tai, sang tai, nang cao
hanh dai » hanh tai, hanh dao, thanh dat
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
cam luc » cam xuc, cau luc
su cac » tu cac, su cao, su can
luc va » duc va, tuc va, loc va
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: su cac ky ((nang tai) or (tang tai)) roi. hieu ve cam luc va ((hanh dai) OR (vanh dai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su cac ky ((nang tai) OR (tang tai)) roi. hieu ve cam luc va ((hanh dai) OR (vanh dai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su cac ky ((nang tai) or (tang tai)) roi. hieu ve cam luc va ((hanh dai) OR (vanh dai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su cac ky ((nang tai) or (tang tai)) roi. hieu ve cam luc va ((hanh dai) OR (vanh dai)) cua tre*.