Perhaps you should try some spelling variations:
chat truc » cau truc, chat xuc
thu sach » tu sach, thuat sach, thuoc sach
hieu cao » chieu cao, hieu cac, hieu ca
danh dai » danh dau, danh di, danh sai
cau tren » cu tren, dau tren, ca tren
sach ky » sac ky, sach y, sach ty
nang xa » lang xa, nang ma, mang xa
truc va » thuc va, thuc vat, trung va
va danh » va dinh, va dan, va hanh
cua tre » cua te, cuu tre, cua triet

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 ((nang xa) OR (nang x)) hoi. hieu cao chat truc va danh dai ((cua tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((nang xa) OR (nang x)) hoi. hieu cao chat truc va danh dai ((cua tre) OR (cau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky ((nang xa) OR (nang x)) hoi. hieu cao chat truc va danh dai ((cua tre) or (cau tren))".
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((nang xa) OR (nang x)) hoi. hieu cao chat truc va danh dai ((cua tre) or (cau tren))*.