Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
nang mai » nang ma, nang tai, lang mai
sach ky » sac ky, sach y, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
van cac » van cau, van bac, dan cac
van hac » van hoc, van ha, van hai
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
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: thuat sach ky nang mai hoi. hieu ((van cac) or (van hac)) dat ((va hanh) or (va danh)) vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky nang mai hoi. hieu ((van cac) OR (van hac)) dat ((va hanh) OR (va danh)) vi cua vat.
• Adding a wildcard symbol may retrieve word variants: thuat sach ky nang mai hoi. hieu ((van cac) or (van hac)) dat ((va hanh) or (va danh)) vi cua vat*.