Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
dang xay » dang van, van xay
ba trung » tai trung, nam trung, do trung
trung va » truong va, trang va, trung ha
su sach » so sach, vu sach
vien ba » vien da, vien va, vien xa
va hanh » van hanh, va thanh, va danh
di cua » doi cua, de cua, do cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y ((nang x) or (dang xay)) hoi. hieu vien ba trung va hanh ((di cua) or (dai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((nang x) OR (dang xay)) hoi. hieu vien ba trung va hanh ((di cua) OR (dai cua)) triet.
• Adding a wildcard symbol may retrieve word variants: su sach y ((nang x) or (dang xay)) hoi. hieu vien ba trung va hanh ((di cua) or (dai cua)) triet*.