Perhaps you should try some spelling variations:
van thanh » ban thanh
vien cac » vien bach, vien dai, vien da
van tuan » van quan, van ban, anh tuan
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
sac ky » cac ky, sai ky
ve cac » va cac
ma hoi » mai hoi, xa hoi, ma hoa
su sac » su sach, su cac, su xac

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky nang ma hoi. hieu ((ve cac) or (vien cac)) luc ((van thanh) OR (van tuan)) hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky nang ma hoi. hieu ((ve cac) OR (vien cac)) luc ((van thanh) OR (van tuan)) hai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky nang ma hoi. hieu ((ve cac) or (vien cac)) luc ((van thanh) OR (van tuan)) hai cua tre*".