Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu cac » hieu luc, hieu va, hieu van
danh dai » danh dau, danh di, danh sai
sach ky » sac ky, sach ty, sach kem
nang xa » nang x, lang xa, nang ma
cac cau » cac mau, bac cau, ca cau
truc va » thuc va, thuc vat, trung va
va danh » va dinh, va dan, va hanh
cua tre » cua te, cuu tre, dua tren

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