Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
vien cac » vien bach, vien dai, vien da
sach ky » sac ky, sach y, sach ty
va hanh » va thanh, va danh, ban hanh
cao hoi » cau hoi, co hoi, cao hoc
ve cac » va cac
di cua » dai cua, doi cua, de cua
cua te » cua tu

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