Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
toc sach » hoc sach, doc sach, thuoc sach
ky trong » ly trong, ke trong, cay trong
kho tang » cao tang
hieu ve » hieu va, hieu van
cac dac » cac dan, cac dai, cac bac
dac van » cac van, dao van, dam van
de cua » le cua, te cua, dieu cua
ve cac » va cac, vien cac
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 ((ky trong) or (kho tang)) xa hoi. hieu ve cac dac van thanh ((vi cua) or (de cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((ky trong) OR (kho tang)) xa hoi. hieu ve cac dac van thanh ((vi cua) OR (de cua)) te.
• Adding a wildcard symbol may retrieve word variants: toc sach ((ky trong) or (kho tang)) xa hoi. hieu ve cac dac van thanh ((vi cua) or (de cua)) te*.