Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
danh dai » danh dau, danh di, danh sai
vien cac » vien bach, vien dai, vien da
tu sach » thu sach, te sach, tu cach
va danh » va dinh, va dan, va hanh
cac lop » cac hop, cac loai
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
su sach » so sach, vu sach
cua tre » cua te, cuu tre, cua triet
lop va » lap va, hop va, nop va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (su sach)) ky ((nang xa) OR (lang xa)) hoi. hieu vien cac lop va danh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky ((nang xa) OR (lang xa)) hoi. hieu vien cac lop va danh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ky ((nang xa) OR (lang xa)) hoi. hieu vien cac lop va danh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky ((nang xa) OR (lang xa)) hoi. hieu vien cac lop va danh dai cua tre*.