Perhaps you should try some spelling variations:
hieu thien » hieu hien, chieu chien, dieu khien
thien cac » hien cac, thien cau, thieu cac
hang vai » hang tai, hang hai, hang vi
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
cac duc » cac du, cao duc, cac dac
duc ban » duc tan, duc van, dua ban
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang

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 v nang x ho. hieu thien cac duc ban ((hang vai) or (hang va)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach v nang x ho. hieu thien cac duc ban ((hang vai) OR (hang va)) su triet.
• Adding a wildcard symbol may retrieve word variants: tu sach v nang x ho. hieu thien cac duc ban ((hang vai) or (hang va)) su triet*.