Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thi hang » thi hanh, thi nang, thi hong
dua tren » dung tren
qua cham » qua hai, qua cac, va cham
thanh di » thanh doi, thanh de, thanh do
sach thi » sach thu, sach tai, sach thieu
su sach » so sach, vu sach
hang xa » hoang xa, hang va, hang ca
tuc va » thuc va, truc va, tuc xa
xac va » tac va, ac va, bac va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach thi hang xa hoi. hieu qua cham ((xac va) or (tuc va)) thanh di ((dua tren) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thi hang xa hoi. hieu qua cham ((xac va) OR (tuc va)) thanh di ((dua tren) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: su sach thi hang xa hoi. hieu qua cham ((xac va) or (tuc va)) thanh di ((dua tren) or (cua triet))*.