Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
lang xa » lang ha, dang xay, lang van
tuc van » thuc van, truc van, tuc va
cua duc » cua nuoc, cua quoc
cua tuc » cua tu, cua thuoc, luat tuc
sach o » sach lo, sac o, sach y
o lang » hoa lang, hoi lang
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach o lang xa hoi. hieu ((ve cam) or (va cac)) tuc van hanh vi ((cua duc) or (cua tuc))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach o lang xa hoi. hieu ((ve cam) OR (va cac)) tuc van hanh vi ((cua duc) OR (cua tuc)).
• Adding a wildcard symbol may retrieve word variants: te sach o lang xa hoi. hieu ((ve cam) or (va cac)) tuc van hanh vi ((cua duc) or (cua tuc))*.