Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
van hanh » van thanh, ban hanh, van anh
trang xa » trang va, trang ha, trong xa
hieu van » hieu va, thien van, lieu va
cu tren » tu tren, dua tren
luc van » luoc van, luu van, duc van
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 ((cau treo) or (cu 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 ((cau treo) OR (cu 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 ((cau treo) or (cu tren))*.