Perhaps you should try some spelling variations:
dang xay » dang van, van xay
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, cua triet
cam duc » cam xuc, cao duc, pham duc
lang xa » lang ha, lang van
hanh de » hanh ve, hanh kem
hieu ve » hieu va
duc van » duc va, duc tan, duc manh
de cua » le cua, te cua, dieu cua
te sai » te tai, te bai, te lai
sai ky » sac ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sai ky ((lang xa) or (dang xay)) hoi. ((hieu ve) OR (hieu van)) cam duc van hanh de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sai ky ((lang xa) OR (dang xay)) hoi. ((hieu ve) OR (hieu van)) cam duc van hanh de cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sai ky ((lang xa) or (dang xay)) hoi. ((hieu ve) OR (hieu van)) cam duc van hanh de cua tre".
• Adding a wildcard symbol may retrieve word variants: te sai ky ((lang xa) or (dang xay)) hoi. ((hieu ve) OR (hieu van)) cam duc van hanh de cua tre*.