Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
trang xa » trang va, trang ha, trong xa
hieu van » hieu va, thien van, lieu va
cau tra » ca tra, cau ra, cau truc
luc van » luoc van, luu van, duc van
cau tre » cau tren, cau treo, cuu tre
hanh di » hanh vi, hanh de, hang di
van cam » van nam, van lam, van cau
cam luc » cam xuc, cau luc
san cho » sang cho, san chi, san co
tang xa » tang ma, lang xa, tang ha
tu san » thu san, tu ban, tu can

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu san cho ((tang xa) or (trang xa)) hoi. hieu van cam luc van hanh di ((cau tre) OR (cau tra))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san cho ((tang xa) OR (trang xa)) hoi. hieu van cam luc van hanh di ((cau tre) OR (cau tra)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu san cho ((tang xa) or (trang xa)) hoi. hieu van cam luc van hanh di ((cau tre) OR (cau tra))".
• Adding a wildcard symbol may retrieve word variants: tu san cho ((tang xa) or (trang xa)) hoi. hieu van cam luc van hanh di ((cau tre) OR (cau tra))*.