Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
lam nuoc » lam duoc, lam ngoc, lam nguoi
ky dang » ky danh
van lam » van nam
cua tre » cua te, cuu tre, cua triet
te sac » te sach, te cac, te san
va dan » ca dan, va dau, va dap
va dao » ca dao
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ((ky dang) or (ky nang)) xa hoi. hieu van lam nuoc ((va dan) OR (va dao)) va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ((ky dang) OR (ky nang)) xa hoi. hieu van lam nuoc ((va dan) OR (va dao)) va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ((ky dang) or (ky nang)) xa hoi. hieu van lam nuoc ((va dan) OR (va dao)) va cua tre".
• Adding a wildcard symbol may retrieve word variants: te sac ((ky dang) or (ky nang)) xa hoi. hieu van lam nuoc ((va dan) OR (va dao)) va cua tre*.