Perhaps you should try some spelling variations:
cuu tren » cu tren, cau tren, cuu tuyen
van hanh » van thanh, ban hanh, van anh
trang xa » trang va, trang ha, trong xa
hieu van » hieu va, thien van, lieu va
luc van » luoc van, luu van, duc van
cuu tre » cua tre, cau tren, cau treo
hanh di » hanh vi, hanh de, hang di
van cam » van nam, van lam, van cau
cam luc » cam xuc, cau luc
can cho » chan cho, cap cho, cao cho
tang xa » tang ma, lang xa, tang ha
tu can » tu ban, tu cac, thu canh

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu can cho ((tang xa) or (trang xa)) hoi. hieu van cam luc van hanh di ((cuu tre) or (cuu tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu can cho ((tang xa) OR (trang xa)) hoi. hieu van cam luc van hanh di ((cuu tre) OR (cuu tren)).
• Adding a wildcard symbol may retrieve word variants: tu can cho ((tang xa) or (trang xa)) hoi. hieu van cam luc van hanh di ((cuu tre) or (cuu tren))*.