Perhaps you should try some spelling variations:
hieu van » thien van, hieu ve
thu sai » thu hai, thu tai, thu san
dau xua » dau cua, dao xuan, dau luan
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
cua tre » cua te, cuu tre, cua triet
lang xa » lang ha, dang xay, lang van
hieu va » hieu qua
ky lang » ky nang, ky dang, ky tang
sai ky » sac ky
xua va » xuat va, vua va, sua va
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sai ky lang xa hoi. ((((hieu van) OR (hieu va))) or (lieu va)) dau xua va danh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sai ky lang xa hoi. ((((hieu van) OR (hieu va))) OR (lieu va)) dau xua va danh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sai ky lang xa hoi. ((((hieu van) OR (hieu va))) or (lieu va)) dau xua va danh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sai ky lang xa hoi. ((((hieu van) OR (hieu va))) or (lieu va)) dau xua va danh vi cua tre*.