Perhaps you should try some spelling variations:
nang mai » nang ma, nang tai, lang mai
hanh tai » thanh tai, hang tai, han tai
tu sach » thu sach, su sach, te sach
thuc va » thuc vat, thuc dan, thuc day
van tai » von tai, van tuan
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
tuc va » truc va, tuc xa, duc va
ve cam » ve cham, ve cac, va cam

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 ky nang mai hoi. hieu ve cam ((tuc va) OR (thuc va)) ((hanh tai) or (van tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang mai hoi. hieu ve cam ((tuc va) OR (thuc va)) ((hanh tai) OR (van tai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang mai hoi. hieu ve cam ((tuc va) OR (thuc va)) ((hanh tai) or (van tai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang mai hoi. hieu ve cam ((tuc va) OR (thuc va)) ((hanh tai) or (van tai)) cua tre*.