Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
toc sach » hoc sach, doc sach, thuoc sach
kho tang » cao tang
ky tang » ky nang, ky dang, ky trong
hieu ve » hieu va, hieu van
cam duc » cam xuc, cao duc, pham duc
duc van » duc va, duc tan, duc manh
di cua » dai cua, doi cua, de cua
vi cua » vai cua
ve cam » ve cham, ve cac, va cam

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 tang) OR (kho tang)) xa hoi. hieu ve cam duc van thanh ((vi cua) or (di cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((ky tang) OR (kho tang)) xa hoi. hieu ve cam duc van thanh ((vi cua) OR (di cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((ky tang) OR (kho tang)) xa hoi. hieu ve cam duc van thanh ((vi cua) or (di cua)) te".
• Adding a wildcard symbol may retrieve word variants: toc sach ((ky tang) OR (kho tang)) xa hoi. hieu ve cam duc van thanh ((vi cua) or (di cua)) te*.