Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
thanh vi » hanh vi, thanh va, thanh ve
chat doc » chat hoc, chau doc, thuat doc
chat soc » cham soc, chat hoc, chat song
cau tren » cu tren, dau tren, ca tren
hieu ve » hieu va, hieu van
vu nang » vuc nang, va nang, vu dang
y nang » ky nang, ly nang, v nang
vi cau » va cau, ve cau, di cau

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 ((y nang) or (vu nang)) xa hoi. hieu ve ((chat soc) or (chat doc)) gia thanh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((y nang) OR (vu nang)) xa hoi. hieu ve ((chat soc) OR (chat doc)) gia thanh vi cau tren.
• Adding a wildcard symbol may retrieve word variants: toc sach ((y nang) or (vu nang)) xa hoi. hieu ve ((chat soc) or (chat doc)) gia thanh vi cau tren*.