Perhaps you should try some spelling variations:
thi nhung » thi nang, thi hong, thi huong
nhung cau » chung cu, nhung bai, nhu cau
hanh dai » hanh tai, hanh dao, vanh dai
hieu cao » chieu cao, hieu cac, hieu ca
su triet » su tien, ve triet
sach thi » sach thu, sach tai, sach thieu
tu sach » thu sach, su sach, te sach
su viet » so viet
luc va » duc va, loc va
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 nhung cau hoi. hieu cao chat ((tuc va) or (luc va)) hanh dai ((su triet) or (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thi nhung cau hoi. hieu cao chat ((tuc va) OR (luc va)) hanh dai ((su triet) OR (su viet)).
• Adding a wildcard symbol may retrieve word variants: tu sach thi nhung cau hoi. hieu cao chat ((tuc va) or (luc va)) hanh dai ((su triet) or (su viet))*.