Perhaps you should try some spelling variations:
va thanh » ban thanh, va tinh, le thanh
ky lang » ky dang, ky tang, tay lang
hieu ve » hieu va, hieu van
cac luc » cau luc, coc luc, cac nuoc
cua tre » cua te, cuu tre, cua triet
vu sac » vu sach, vu san, va sac
ve cac » va cac, vien cac
ha cua » hoa cua, hai cua, nha cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sac ((ky lang) or (ky nang)) xa hoi. hieu ve cac luc ((va thanh) OR (gia thanh)) ha cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sac ((ky lang) OR (ky nang)) xa hoi. hieu ve cac luc ((va thanh) OR (gia thanh)) ha cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sac ((ky lang) or (ky nang)) xa hoi. hieu ve cac luc ((va thanh) OR (gia thanh)) ha cua tre".
• Adding a wildcard symbol may retrieve word variants: vu sac ((ky lang) or (ky nang)) xa hoi. hieu ve cac luc ((va thanh) OR (gia thanh)) ha cua tre*.