Perhaps you should try some spelling variations:
thanh doc » than doc, thanh do, nhanh doc
van thanh » ban thanh, van tuan
manh cua » doanh cua, ban cua
hieu van » hieu va, thien van, lieu va
toc sach » hoc sach, doc sach, thuoc sach
sach ky » sac ky, sach y, sach ty
ha hoi » hoa hoi, ha noi, va hoi
doc va » duoc va, hoc va, duc va
va dan » ca dan, va dao, va dau
vi cuu » vi luu, vinh cuu

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 nang ((ha hoi) OR (xa hoi)). hieu van thanh doc va dan ((vi cuu) or (manh cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang ((ha hoi) OR (xa hoi)). hieu van thanh doc va dan ((vi cuu) OR (manh cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky nang ((ha hoi) OR (xa hoi)). hieu van thanh doc va dan ((vi cuu) or (manh cua)) tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang ((ha hoi) OR (xa hoi)). hieu van thanh doc va dan ((vi cuu) or (manh cua)) tre*.