Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
toc sach » hoc sach, thuoc sach, nuoc sach
cham tuc » nham thuc, pham thuc, tham thuc
ban hanh » ban hang
doc sach » hoc sach, nuoc sach, dac sac
lang van » dang van, tang van, hoang van
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
van hoe » van hoa, van hoc, van hieu
y lang » o lang, _ lang, tay lang
vi cua » vai cua, di cua
cua te » cua tu

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) OR (doc sach)) y lang van hoe. hieu ve cham tuc ((van thanh) or (ban hanh)) vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (doc sach)) y lang van hoe. hieu ve cham tuc ((van thanh) OR (ban hanh)) vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (doc sach)) y lang van hoe. hieu ve cham tuc ((van thanh) or (ban hanh)) vi cua te".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (doc sach)) y lang van hoe. hieu ve cham tuc ((van thanh) or (ban hanh)) vi cua te*.