Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, le thanh
thai cua » than cua, tai cuc, tri cua
cay phoi » cap phoi, tay hoi, cay cho
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, cua triet
va tinh » may tinh
lam xuc » cam xuc, lam duoc
van lam » van nam
ky dang » ky danh
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 dang) OR (ky nang)) cay phoi. hieu van lam xuc ((va thanh) or (va tinh)) thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ((ky dang) OR (ky nang)) cay phoi. hieu van lam xuc ((va thanh) OR (va tinh)) thai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ((ky dang) OR (ky nang)) cay phoi. hieu van lam xuc ((va thanh) or (va tinh)) thai cua tre".
• Adding a wildcard symbol may retrieve word variants: su sac ((ky dang) OR (ky nang)) cay phoi. hieu van lam xuc ((va thanh) or (va tinh)) thai cua tre*.