Perhaps you should try some spelling variations:
nang mai » nang ma, nang tai, lang mai
nham thu » nham thuc, nam thu, pham thu
sach ty » sach tu, sach thu, xach tay
xanh di » vanh dai, xanh tai
danh di » danh du, danh dien, danh gia
va nham » va cham, va tham, va nha
hieu va » lieu va, hieu qua
mai hoi » mai khoi, dai hoi, lai hoi
cua tre » cua te, cuu tre, cua triet
thu va » thuc va, thue va, tu va

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc ((sach ty) or (sach y)) nang mai hoi. hieu va nham thu va ((danh di) OR (xanh di)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach ty) OR (sach y)) nang mai hoi. hieu va nham thu va ((danh di) OR (xanh di)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach ty) or (sach y)) nang mai hoi. hieu va nham thu va ((danh di) OR (xanh di)) cua tre".
• Adding a wildcard symbol may retrieve word variants: toc ((sach ty) or (sach y)) nang mai hoi. hieu va nham thu va ((danh di) OR (xanh di)) cua tre*.