Perhaps you should try some spelling variations:
kien sach » dien sach, vien bach, kien mac
trung cua » truong cua, trung tuan, dung cua
trung cap » truong cao, trung tam
hang cong » dang cong, hang nong, bang cong
hoc kien » hoc hien, hoc vien, hoa kien
cong dan » cong san, cong tan, huong dan
than tap » toan tap, phan tap, than cap
han tap » han tai, toan tap, nhan tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc kien sach - hanh ((trung cua) or (trung cap)) hang cong dan ((than tap) OR (han tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc kien sach - hanh ((trung cua) OR (trung cap)) hang cong dan ((than tap) OR (han tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc kien sach - hanh ((trung cua) or (trung cap)) hang cong dan ((than tap) OR (han tap))".
• Adding a wildcard symbol may retrieve word variants: hoc kien sach - hanh ((trung cua) or (trung cap)) hang cong dan ((than tap) OR (han tap))*.