Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
hoc chieu » ho chieu, hoc hien, hoc dieu
hoc thieu » toc thieu, hoc hien
trung cua » truong cua, trung tuan, trung cap
truong ca » truong cao, truong va, trong ca
cong dan » cong san, cong tan, huong dan
gian ban » gian bana, gian dan, gian lan

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

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