Perhaps you should try some spelling variations:
te sach » toc sach
sach ky » sac ky, sach y, sach ty
cao hoi » cau hoi, co hoi, tao hoi
cao hoc » co hoc, cho hoc, chat hoc
hieu ve » hieu va, hieu van
cuu tre » cua tre, cau tren, cau treo
ve cam » ve cham, ve cac, va cam
xuc va » tuc va, luc va, xac va
vi cuu » vi luu, vinh cuu

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 ky nang ((cao hoi) OR (cao hoc)). hieu ve cam ((xuc va) or (duc va)) hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ((cao hoi) OR (cao hoc)). hieu ve cam ((xuc va) OR (duc va)) hanh vi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ((cao hoi) OR (cao hoc)). hieu ve cam ((xuc va) or (duc va)) hanh vi cuu tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ((cao hoi) OR (cao hoc)). hieu ve cam ((xuc va) or (duc va)) hanh vi cuu tre*.