Perhaps you should try some spelling variations:
nhanh thai » nhanh thi, nhanh thanh, nhanh thang
dang khoa » dung khoa, hang khoa, dang khoi
khoa hoi » khoan hoi, khoa hoc, khoa doi
thai cua » than cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
ky dang » ky nang, ky danh
duc van » duc tan, duc manh, duc phan
su dai » sau dai, si dai, su tai
va cam » va cham, va cac, va cao
dai ky » dan ky, dai ly, sai ky
ve cam » ve cham, ve cac, ve cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: su dai ky dang khoa hoi. hieu ((ve cam) or (va cam)) ((duc van) or (duc va)) nhanh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su dai ky dang khoa hoi. hieu ((ve cam) OR (va cam)) ((duc van) OR (duc va)) nhanh thai cua tre.
• Adding a wildcard symbol may retrieve word variants: su dai ky dang khoa hoi. hieu ((ve cam) or (va cam)) ((duc van) or (duc va)) nhanh thai cua tre*.