Perhaps you should try some spelling variations:
va nhanh » va thanh, va hanh, va nhan
doi nang » dai nang, voi nang, doi mang
thai cua » than cua, tai cuc, tri cua
hoi nang » hoi lang, ho nang, hoa nang
tu sach » thu sach, su sach, te sach
hai cua » dai cua, hoi cua, lai cua
hieu va » lieu va, hieu qua
cam duc » cam xuc, cao duc, pham duc
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((doi nang) or (hoi nang)) xa hoi. hieu va cam duc va nhanh ((hai cua) OR (thai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((doi nang) OR (hoi nang)) xa hoi. hieu va cam duc va nhanh ((hai cua) OR (thai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((doi nang) or (hoi nang)) xa hoi. hieu va cam duc va nhanh ((hai cua) OR (thai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((doi nang) or (hoi nang)) xa hoi. hieu va cam duc va nhanh ((hai cua) OR (thai cua)) tre*.