Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
lang xa » lang ha, dang xay, lang van
ve cham » va cham, ve chat, vu cham
tuc van » thuc van, truc van, tuc va
cua duc » cua tuc, cua nuoc, cua quoc
y lang » o lang, _ lang, tay lang
ve cam » ve cac, va cam, ve cai
vi cua » vai cua, di cua

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

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