Perhaps you should try some spelling variations:
hieu quan » lieu quan, thien quan, lien quan
sach thi » sach tai, sach thieu, sach tham
sach thu » sach thue, sach thieu, sach tham
kinh vai » kinh hai, kinh va, kinh van
hang xa » hoang xa, hang va, hang ca
va kinh » va tinh, qua kinh
vai cua » dai cua, hai cua, lai cua
xuc va » duc va, tuc va, luc va

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