Perhaps you should try some spelling variations:
cua tre » cua te, cuu tre, cua triet
va cham » va chat, va tham
tinh vi » trinh vi, tinh voi, tinh va
va tinh » may tinh
cao hoi » cau hoi, co hoi, cao hoc
thue va » thuc va, thuyet va, thuc vat
vi cua » vai cua, di cua
cai ky » cao ky, cac ky, sai ky
ve cam » ve cham, ve cac, va cam
cam ky » cao ky, cac ky

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((cai ky) OR (cam ky)) nang cao hoi. hieu ((ve cam) OR (va cham)) thue va tinh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((cai ky) OR (cam ky)) nang cao hoi. hieu ((ve cam) or (va cham)) thue va tinh vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu ((cai ky) OR (cam ky)) nang cao hoi. hieu ((ve cam) or (va cham)) thue va tinh vi cua tre*.