Perhaps you should try some spelling variations:
xay hanh » day nhanh, day thanh, xanh hanh
hieu van » thien van, lieu va
hieu va » lieu va, hieu qua
hanh va » hang va, hanh vi
cuu tre » cua tre, cau tren, cau treo
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
cam tu » cam thu, nam tu, dam tu
va cuu » va cau, va chu, va huu

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 nang x ho. ((hieu ve) or (((hieu van) OR (hieu va)))) cam tu xay hanh va cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky nang x ho. ((hieu ve) OR (((hieu van) OR (hieu va)))) cam tu xay hanh va cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky nang x ho. ((hieu ve) or (((hieu van) OR (hieu va)))) cam tu xay hanh va cuu tre".
• Adding a wildcard symbol may retrieve word variants: te sac ky nang x ho. ((hieu ve) or (((hieu van) OR (hieu va)))) cam tu xay hanh va cuu tre*.