Perhaps you should try some spelling variations:
sach hoi » sach doi, sach moi, cach thoi
hoi nang » hoi lang, ho nang, hoa nang
cham xuc » cam xuc, chat xuc, cham soc
hanh vin » hanh tin, hanh van, thanh vien
cau tren » cu tren, dau tren, ca tren
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
ma hoi » mai hoi, xa hoi, ma hoa
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: tu sach hoi nang ma hoi. hieu ve cham xuc va ((hanh vin) or (hanh vi)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoi nang ma hoi. hieu ve cham xuc va ((hanh vin) OR (hanh vi)) cau tren.
• Adding a wildcard symbol may retrieve word variants: tu sach hoi nang ma hoi. hieu ve cham xuc va ((hanh vin) or (hanh vi)) cau tren*.