Perhaps you should try some spelling variations:
dau tren » dau tien, dat tren, dau tieng
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va thanh, va danh
va chat » van chat, va phat, cao chat
tu sach » thu sach, su sach, te sach
ve cham » va cham, vu cham, ve chim
nang co » nang cao, nang doc, nang noi
ve chat » van chat
co hoi » co hoc, co loi
xuc va » duc va, tuc va, luc va
vi dau » vi dai, va dau, bi dau

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang co hoi. hieu ((ve cham) or (((ve chat) OR (va chat)))) xuc va hanh vi dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang co hoi. hieu ((ve cham) OR (((ve chat) OR (va chat)))) xuc va hanh vi dau tren*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang co hoi. hieu ((ve cham) or (((ve chat) OR (va chat)))) xuc va hanh vi dau tren*".