Perhaps you should try some spelling variations:
trien nang » trien nong, trien mang, thien nang
sach trien » sach tien, sach tren, sach thieu
hieu van » hieu va, thien van, lieu va
va doanh » van doanh, vay doanh, va danh
cham xuc » cam xuc, chat xuc, cham soc
ban cua » ban quan
ban cuu » ban cau, ban muu, ban cung
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va
xuc va » duc va, tuc va, luc va
ma hoi » mai hoi, xa hoi, ma hoa

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 trien nang ma hoi. ((hieu ve) or (hieu van)) cham xuc va doanh ((ban cuu) or (ban cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach trien nang ma hoi. ((hieu ve) OR (hieu van)) cham xuc va doanh ((ban cuu) OR (ban cua)) tre.
• Adding a wildcard symbol may retrieve word variants: tu sach trien nang ma hoi. ((hieu ve) or (hieu van)) cham xuc va doanh ((ban cuu) or (ban cua)) tre*.