Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
lang ha » long ha
lang xa » dang xay, lang van
sac ky » cac ky, sai ky
soc va » loc va, doc va, goc va
vi cua » vai cua, di cua
te sac » te sach, te cac, te san

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 ((lang xa) or (lang ha)) hoi. hieu va thanh ((soc va) OR (hoc va)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky ((lang xa) OR (lang ha)) hoi. hieu va thanh ((soc va) OR (hoc va)) hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky ((lang xa) or (lang ha)) hoi. hieu va thanh ((soc va) OR (hoc va)) hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: te sac ky ((lang xa) or (lang ha)) hoi. hieu va thanh ((soc va) OR (hoc va)) hanh vi cua tre*.