Perhaps you should try some spelling variations:
tai nhanh » tai thanh, thai thanh, tai chinh
nhanh cau » nhanh cay, thanh chau, nhanh ha
sach tai » sach bai, sach tham, sach dao
cam thuc » am thuc, nam thuc, cam thu
thuc van » thuc vat, thuc dan, thuc va
nhan tai » hang tai, van tai, toan tai
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
qua cam » qua cham, qua cac, qua ca
han tai » hang tai, van tai, toan tai

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 tai nhanh cau hoi. hieu qua cam thuc van ((han tai) or (nhan tai)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tai nhanh cau hoi. hieu qua cam thuc van ((han tai) OR (nhan tai)) su triet.
• Adding a wildcard symbol may retrieve word variants: tu sach tai nhanh cau hoi. hieu qua cam thuc van ((han tai) or (nhan tai)) su triet*.