Perhaps you should try some spelling variations:
thi nhanh » chi nhanh, thi thanh, thi hanh
nhanh cau » nhanh cay, thanh chau, nhanh ha
su triet » su viet, su tien, ve triet
sach thi » sach thu, sach tai, sach thieu
nhan tai » hang tai, van tai, toan tai
hanh tai » thanh tai, hang tai, han tai
tu sach » thu sach, su sach, te sach
tuc van » thuc van, truc van, duc van
qua cam » qua cham, qua cac, qua ca
tuc va » thuc va, truc va, tuc xa

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) OR (tuc va)) ((hanh tai) or (nhan 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) OR (tuc va)) ((hanh tai) OR (nhan tai)) su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thi nhanh cau hoi. hieu qua cam ((tuc van) OR (tuc va)) ((hanh tai) or (nhan tai)) su triet".
• Adding a wildcard symbol may retrieve word variants: tu sach thi nhanh cau hoi. hieu qua cam ((tuc van) OR (tuc va)) ((hanh tai) or (nhan tai)) su triet*.