Perhaps you should try some spelling variations:
danh sai » dung sai, danh bat, danh dau
hieu cac » hieu luc, hieu va, hieu van
sai cua » dai cua, hai cua, lai cua
va danh » va dinh, va dan, va hanh
truc va » thuc va, thuc vat, trung va
cac cau » cac mau, bac cau, ca cau
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach ty, sach kem
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sach ky) or (sach y)) ((nang xa) OR (nang ma)) hoi. hieu cac cau truc va danh sai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (sach y)) ((nang xa) OR (nang ma)) hoi. hieu cac cau truc va danh sai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ky) or (sach y)) ((nang xa) OR (nang ma)) hoi. hieu cac cau truc va danh sai cua tre*".