Perhaps you should try some spelling variations:
doanh cao » doanh co, doanh bao, doanh cho
trinh van » trinh han, trinh quan, trinh toan
hieu van » hieu va, thien van, lieu va
lang van » dang van, tang van, hoang van
cao cua » ca cua, co cua, cau cua
tri van » thi van, tri va, tri nhan
te sach » toc sach
van cac » van hac, van cau, van bac
sach ty » sach y, sach tu, sach thu
lang xa » lang ha, dang xay
cua tu » cua tuc, cua su, cua cu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty ((lang xa) OR (lang van)) hoi. hieu van cac ((tri van) OR (trinh van)) doanh cao cua tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty ((lang xa) or (lang van)) hoi. hieu van cac ((tri van) OR (trinh van)) doanh cao cua tu~".
• Adding a wildcard symbol may retrieve word variants: te sach ty ((lang xa) or (lang van)) hoi. hieu van cac ((tri van) OR (trinh van)) doanh cao cua tu*.