Perhaps you should try some spelling variations:
cua tre » cua te, cuu tre, cua triet
doan vi » doan va, don vi, doan thi
va doan » va doanh, van doan, va dan
truc va » thuc va, thuc vat, trung va
va cham » va chat, va tham
ve cham » ve chat, vu cham, ve chim
nang ma » tang ma, nang cao, mang may
sang ma » tang ma, sang tao, mang may
sac ky » cac ky, sai ky
vi cua » vai cua, di cua
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 (nang ma)) hoi. hieu ((ve cham) or (va cham)) truc va doan vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((sang ma) OR (nang ma)) hoi. hieu ((ve cham) OR (va cham)) truc va doan vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((sang ma) or (nang ma)) hoi. hieu ((ve cham) or (va cham)) truc va doan vi cua tre*.