Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh tai, hanh van
mai khoi » mai khoa, tai khoa, dai khoa
cac khoi » cac thoi, cac khoan, cach thoi
tu sach » thu sach, su sach, te sach
hanh va » hang va, hanh vi
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
cu tren » tu tren, dua tren
ve cam » ve cham, ve cac, va cam
xuc va » duc va, tuc va, luc va
ty anh » ly anh, thuy anh

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 ty anh ((mai khoi) OR (cac khoi)). hieu ve cam xuc va ((hanh vai) or (hanh va)) cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty anh ((mai khoi) OR (cac khoi)). hieu ve cam xuc va ((hanh vai) OR (hanh va)) cu tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty anh ((mai khoi) OR (cac khoi)). hieu ve cam xuc va ((hanh vai) or (hanh va)) cu tren".
• Adding a wildcard symbol may retrieve word variants: tu sach ty anh ((mai khoi) OR (cac khoi)). hieu ve cam xuc va ((hanh vai) or (hanh va)) cu tren*.