Perhaps you should try some spelling variations:
nhanh thai » nhanh thi, nhanh thanh, nhanh thang
thai cua » than cua, tai cuc, tri cua
dang mai » dang hai, dang mau, dang bai
cua tre » cua te, cuu tre, cua triet
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
ky dang » ky nang, ky danh
luc va » tuc va, loc va
tu ban » thu ban, te ban
tu san » thu san, tu can, vu san

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu san) OR (tu ban)) ky dang mai hoi. hieu ve cham ((luc va) or (duc va)) nhanh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu san) OR (tu ban)) ky dang mai hoi. hieu ve cham ((luc va) OR (duc va)) nhanh thai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu san) OR (tu ban)) ky dang mai hoi. hieu ve cham ((luc va) or (duc va)) nhanh thai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu san) OR (tu ban)) ky dang mai hoi. hieu ve cham ((luc va) or (duc va)) nhanh thai cua tre*.