Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
van tuan » van quan, van ban, anh tuan
tuan vi » quan vi, luan vi, quans vi
duc van » duc va, duc tan, duc manh
ve cham » va cham, ve chat, vu cham
cua tre » cua te, cuu tre, cua triet
ky dang » ky nang, ky danh
ky lang » ky nang, ky tang, tay lang
ve cam » ve cac, va cam, ve cai
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 lang) OR (ky dang)) xa hoi. hieu ((ve cam) or (ve cham)) duc van tuan vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((ky lang) OR (ky dang)) xa hoi. hieu ((ve cam) OR (ve cham)) duc van tuan vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((ky lang) OR (ky dang)) xa hoi. hieu ((ve cam) or (ve cham)) duc van tuan vi cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ((ky lang) OR (ky dang)) xa hoi. hieu ((ve cam) or (ve cham)) duc van tuan vi cua tre*.