Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, lieu vien
tan lanh » tai lanh, thanh lanh, tan thanh
thai cua » than cua, tai cuc, tri cua
dang xay » dang van, van xay
hai cua » dai cua, hoi cua, lai cua
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
cac duc » cao duc, cac dac, cac nuoc
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh

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 ky dang xay hoi. hieu vien ((cac duc) OR (cac du)) tan lanh ((hai cua) or (thai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky dang xay hoi. hieu vien ((cac duc) OR (cac du)) tan lanh ((hai cua) OR (thai cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky dang xay hoi. hieu vien ((cac duc) OR (cac du)) tan lanh ((hai cua) or (thai cua)) triet".
• Adding a wildcard symbol may retrieve word variants: su sach ky dang xay hoi. hieu vien ((cac duc) OR (cac du)) tan lanh ((hai cua) or (thai cua)) triet*.