Perhaps you should try some spelling variations:
dang xay » dang van, van xay
hieu van » hieu va, thien van, lieu va
hanh dai » hanh tai, hanh dao, vanh dai
lang xa » lang ha, lang van
van lam » van nam
lam luc » lao luc, lam duoc
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
luc va » duc va, tuc va, loc va

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 (dang xay)) hoi. hieu van lam luc va hanh dai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky ((lang xa) OR (dang xay)) hoi. hieu van lam luc va hanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: te sac ky ((lang xa) OR (dang xay)) hoi. hieu van lam luc va hanh dai cua tre*.