Perhaps you should try some spelling variations:
ky lang » ky dang, ky tang, tay lang
va cham » va chat, va tham
tu cham » toc cham, thi cham
cua tre » cua te, cuu tre, cua triet
tu sai » tu bai, tu san, tu cai
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va
vi cua » vai cua, di 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 sai ((ky lang) or (ky nang)) hoa hoc. hieu ((va cham) or (tu cham)) hoc va dan vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sai ((ky lang) OR (ky nang)) hoa hoc. hieu ((va cham) OR (tu cham)) hoc va dan vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sai ((ky lang) or (ky nang)) hoa hoc. hieu ((va cham) or (tu cham)) hoc va dan vi cua tre*.