Perhaps you should try some spelling variations:
dan khanh » dang khanh, van khanh, dat khanh
vien cac » vien bach, vien dai, vien da
dan hanh » dang hanh, dan thanh, ban hanh
thu sac » thu sach, thu san, thu xac
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
va cam » va cham, va cac, va cao
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: thu sac ky dang xa hoi. hieu ((va cam) or (vien cac)) thuc ((dan hanh) or (dan khanh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sac ky dang xa hoi. hieu ((va cam) OR (vien cac)) thuc ((dan hanh) OR (dan khanh)) vi cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sac ky dang xa hoi. hieu ((va cam) or (vien cac)) thuc ((dan hanh) or (dan khanh)) vi cua tre*.