Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
thanh vi » hanh vi, thanh va, thanh ve
chat hoc » chat hoa, chat thom, cho hoc
chat soc » cham soc, chat doc, chat song
te sach » toc sach
hieu ve » hieu va, hieu van
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van 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: te sach ((y nang) or (v nang)) xa hoi. hieu ve ((chat soc) OR (chat hoc)) gia thanh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((y nang) OR (v nang)) xa hoi. hieu ve ((chat soc) OR (chat hoc)) gia thanh vi cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((y nang) or (v nang)) xa hoi. hieu ve ((chat soc) OR (chat hoc)) gia thanh vi cau tren".
• Adding a wildcard symbol may retrieve word variants: te sach ((y nang) or (v nang)) xa hoi. hieu ve ((chat soc) OR (chat hoc)) gia thanh vi cau tren*.