Perhaps you should try some spelling variations:
nang mai » nang ma, nang tai, lang mai
van chat » cao chat
danh doi » danh di, thanh doi, dung doi
te sach » toc sach
sach ky » sac ky, sach y, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
van bac » van ban, van bao, van hac
truc va » thuc va, thuc vat, trung va
va danh » va dinh, va dan, va hanh
doi cua » dai cua, hoi cua
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: te sach ky nang mai hoi. hieu ((van bac) or (van chat)) truc va danh doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang mai hoi. hieu ((van bac) OR (van chat)) truc va danh doi cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ky nang mai hoi. hieu ((van bac) or (van chat)) truc va danh doi cua tre*.