Perhaps you should try some spelling variations:
thien quan » trien quang, lien quan, thien van
van hanh » van thanh, ban hanh, van anh
hanh di » hanh vi, hanh de, hang di
cua tre » cua te, cuu tre, cua triet
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
nam tu » nam thu, nam thuc
tu van » tu va
di cua » dai cua, doi cua, de 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 sac ky nang x ho. ((thien quan) or (hieu qua)) nam tu van hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang x ho. ((thien quan) OR (hieu qua)) nam tu van hanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang x ho. ((thien quan) or (hieu qua)) nam tu van hanh di cua tre*.