Perhaps you should try some spelling variations:
nhanh tai » nhanh thai, nhan tai, thanh tai
toc sach » hoc sach, doc sach, thuoc sach
nang mai » nang tai, lang mai, nang cai
va nhanh » va thanh, va hanh, va nhan
sach ky » sac ky, sach y, sach ty
cuc tre » duc tre, cua tre, cuu tre
nang ma » tang ma, sang ma, nang cao
ve cao » ve bao, ve cac, ve co
va cao » va cac, va co, va dao

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky ((nang mai) or (nang ma)) hoi. hieu ((ve cao) OR (va cao)) duc va nhanh tai cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky ((nang mai) OR (nang ma)) hoi. hieu ((ve cao) OR (va cao)) duc va nhanh tai cuc tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky ((nang mai) or (nang ma)) hoi. hieu ((ve cao) OR (va cao)) duc va nhanh tai cuc tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ky ((nang mai) or (nang ma)) hoi. hieu ((ve cao) OR (va cao)) duc va nhanh tai cuc tre*.