Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
va thanh » gia thanh, ban thanh, le thanh
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
va tinh » may tinh
ve cam » ve cham, ve cac, ve cai
va cam » va cham, va cac, va cao
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 ky nang ma hoa. hieu ((ve cam) or (va cam)) luc ((va thanh) OR (va tinh)) vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang ma hoa. hieu ((ve cam) OR (va cam)) luc ((va thanh) OR (va tinh)) vi cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang ma hoa. hieu ((ve cam) or (va cam)) luc ((va thanh) OR (va tinh)) vi cua vat".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang ma hoa. hieu ((ve cam) or (va cam)) luc ((va thanh) OR (va tinh)) vi cua vat*.