Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
van thanh » ban thanh, van tuan
kho tang » cao tang
su sach » so sach, vu sach
va cham » va chat, va tham
luc van » luoc van, luu van, duc van
van hoe » van hoa, van hoc, van hieu
ky tang » ky nang, ky dang, ky trong
cuc tre » duc tre, cua tre, cuu tre

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((ky tang) OR (kho tang)) van hoe. hieu ((va cham) or (va cac)) luc van thanh tai cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ky tang) OR (kho tang)) van hoe. hieu ((va cham) OR (va cac)) luc van thanh tai cuc tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ky tang) OR (kho tang)) van hoe. hieu ((va cham) or (va cac)) luc van thanh tai cuc tre".
• Adding a wildcard symbol may retrieve word variants: su sach ((ky tang) OR (kho tang)) van hoe. hieu ((va cham) or (va cac)) luc van thanh tai cuc tre*.