Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
van tuan » van quan, van ban, anh tuan
ky tang » ky dang, kho tang, ky trong
hieu ve » hieu va, hieu van
cam duc » cam xuc, cao duc, pham duc
duc van » duc va, duc tan, duc manh
ve cam » ve cham, ve cac, va cam
vi cua » vai cua
di cua » dai cua, doi cua, de 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 tang) or (ky nang)) xa hoi. hieu ve cam duc van tuan ((vi cua) or (di cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((ky tang) OR (ky nang)) xa hoi. hieu ve cam duc van tuan ((vi cua) OR (di cua)) te.
• Adding a wildcard symbol may retrieve word variants: toc sach ((ky tang) or (ky nang)) xa hoi. hieu ve cam duc van tuan ((vi cua) or (di cua)) te*.