Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cham luc » cham soc, nhan luc, cham cuu
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren
luc van » luoc van, luu van, duc van
vu cham » va cham, vu kham, tu cham
nang xa » lang xa, nang ma, mang xa
hieu vu » hieu va, hieu ve, hieu su
sai ky » sac ky
te sai » te tai, te bai, te lai

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 ((nang xa) or (nang x)) hoi. hieu vu cham luc van hanh vi ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sai ky ((nang xa) OR (nang x)) hoi. hieu vu cham luc van hanh vi ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sai ky ((nang xa) or (nang x)) hoi. hieu vu cham luc van hanh vi ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: te sai ky ((nang xa) or (nang x)) hoi. hieu vu cham luc van hanh vi ((cua tre) OR (cuu tre))*.