Perhaps you should try some spelling variations:
danh doi » danh di, thanh doi, dung doi
van hac » van hoc, van ha, van hai
doi cua » dai cua, hoi cua, dong cua
va danh » va dinh, va dan, va hanh
truc va » thuc va, thuc vat, trung va
van cac » van cau, van bac, dan cac
sach ky » sac ky, sach ty, sach kem
nang xa » nang x, lang xa, nang ma
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) OR (sach y)) nang xa hoi. hieu ((van cac) or (van hac)) truc va danh doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (sach y)) nang xa hoi. hieu ((van cac) OR (van hac)) truc va danh doi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ky) OR (sach y)) nang xa hoi. hieu ((van cac) or (van hac)) truc va danh doi cua tre".
• Adding a wildcard symbol may retrieve word variants: thu ((sach ky) OR (sach y)) nang xa hoi. hieu ((van cac) or (van hac)) truc va danh doi cua tre*.