Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
cac tuc » cac toc, cac tu, cac tac
tuc van » thuc van, truc van, tuc va
cua tuc » cua duc, cua thuoc, luat tuc
sach o » sach lo, sac o, mach o
ve cac » va cac, vien cac
cua tu » cua su, cua cu, cua te

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 o) OR (sach y)) lang xa hoi. hieu ve cac tuc van hanh vi ((cua tu) OR (cua tuc))~.
• Adding a wildcard symbol may retrieve word variants: te ((sach o) or (sach y)) lang xa hoi. hieu ve cac tuc van hanh vi ((cua tu) or (cua tuc))*.