Perhaps you should try some spelling variations:
doan vai » doan va, doan van, doan hai
sang tao » hang tai
cua tre » cua te, cuu tre, cua triet
vai cua » dai cua, hai cua, lai cua
thuc va » thuc vat, thuc dan, thuc day
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
sang ma » tang ma, nang ma, mang may
sac ky » cac ky, sai ky
tuc va » truc va, tuc xa, duc va
tu sac » tu sach, tu cac, tu san

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky ((sang ma) or (sang tao)) hoi. hieu ve cham ((tuc va) OR (thuc va)) doan vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((sang ma) OR (sang tao)) hoi. hieu ve cham ((tuc va) OR (thuc va)) doan vai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky ((sang ma) or (sang tao)) hoi. hieu ve cham ((tuc va) OR (thuc va)) doan vai cua tre*".