Perhaps you should try some spelling variations:
hieu quan » lieu quan, thien quan, lien quan
sach thi » sach thu, sach tai, sach thieu
thi hang » thi hanh, thi nang, thi hong
te sach » toc sach
hang xa » hoang xa, hang va, hang ca
va kinh » qua kinh
va tinh » may tinh
hai cua » thai cua, dai cua, hoi cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach thi hang xa hoi. ((hieu qua) or (hieu quan)) cam xuc ((va kinh) OR (va tinh)) hai cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach thi hang xa hoi. ((hieu qua) OR (hieu quan)) cam xuc ((va kinh) OR (va tinh)) hai cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach thi hang xa hoi. ((hieu qua) or (hieu quan)) cam xuc ((va kinh) OR (va tinh)) hai cua vat".
• Adding a wildcard symbol may retrieve word variants: te sach thi hang xa hoi. ((hieu qua) or (hieu quan)) cam xuc ((va kinh) OR (va tinh)) hai cua vat*.