Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
van cai » van chi, van cau, van ai
van hai » van ha, van chat, van phan
va hanh » va thanh, va danh, ban hanh
vi cua » vai cua, di cua

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 ty nang xa hoi. hieu ((van cai) or (van hai)) dat ((va hanh) OR (van hanh)) vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty nang xa hoi. hieu ((van cai) OR (van hai)) dat ((va hanh) OR (van hanh)) vi cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty nang xa hoi. hieu ((van cai) or (van hai)) dat ((va hanh) OR (van hanh)) vi cua vat".
• Adding a wildcard symbol may retrieve word variants: thu sach ty nang xa hoi. hieu ((van cai) or (van hai)) dat ((va hanh) OR (van hanh)) vi cua vat*.