Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
van hanh » van thanh, ban hanh, van anh
cau tren » cu tren, dau tren, ca tren
nang co » nang cao, nang doc, nang noi
tu sach » su sach, te sach, tu cach
xuc van » duc van, luc van, xuc ban
hanh ve » hanh vi, hanh va, hanh kem
ve cam » ve cham, va cam, ve cai
ve cac » va cac, vien cac
ve cau » ke cau, va cau, le cau

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 (tu sach)) ky nang co hoc. hieu ((ve cam) or (ve cac)) xuc van hanh ve cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (tu sach)) ky nang co hoc. hieu ((ve cam) OR (ve cac)) xuc van hanh ve cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (tu sach)) ky nang co hoc. hieu ((ve cam) or (ve cac)) xuc van hanh ve cau tren".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) OR (tu sach)) ky nang co hoc. hieu ((ve cam) or (ve cac)) xuc van hanh ve cau tren*.