Perhaps you should try some spelling variations:
cac khoi » cac thoi, cac khoan, cach thoi
cua tre » cua te, cuu tre, cua triet
thuc va » thuc vat, thuc dan, thuc day
sac kho » suc khoe, dac khoa, cac khoa
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
tang xa » trang xa, tang ma, lang xa
tuc va » truc va, tuc xa, duc va
dan va » doan va, dan ca, ban va
va cua » va chua, via cua, ca cua

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 kho) OR (cac khoi)) tang xa hoi. hieu ve cham ((tuc va) or (thuc va)) dan va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sac kho) OR (cac khoi)) tang xa hoi. hieu ve cham ((tuc va) OR (thuc va)) dan va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sac kho) OR (cac khoi)) tang xa hoi. hieu ve cham ((tuc va) or (thuc va)) dan va cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sac kho) OR (cac khoi)) tang xa hoi. hieu ve cham ((tuc va) or (thuc va)) dan va cua tre*.