Perhaps you should try some spelling variations:
thi nhanh » chi nhanh, thi thanh, thi hanh
nhanh cau » nhanh cay, thanh chau, nhanh ha
ntoan tai » toan tap, nhan tai, ngoai tai
sach thi » sach thu, sach tai, sach thieu
toan tai » toan tap, doanh tai, toan ban
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
qua cam » qua cham, qua cac, qua ca
cam tuc » cam xuc, cam tu, nam thuc
tuc van » thuc van, truc van, tuc va

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