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