Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thu sach » tu sach, thuat sach, thu hoach
van hanh » van thanh, ban hanh, van anh
dau tren » dau tien, dat tren, dau tieng
cam luc » cam xuc, cau luc
va hanh » va thanh, va danh, ban hanh
va cam » va cham, va cac, va cao
de dau » dem dau, de dao, de dat
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) or (thuoc sach)) ky nang x hoi. lieu va cam luc ((va hanh) OR (van hanh)) de dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuoc sach)) ky nang x hoi. lieu va cam luc ((va hanh) OR (van hanh)) de dau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (thuoc sach)) ky nang x hoi. lieu va cam luc ((va hanh) OR (van hanh)) de dau tren".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (thuoc sach)) ky nang x hoi. lieu va cam luc ((va hanh) OR (van hanh)) de dau tren*.