Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
trung tuan » trung thanh, trung tam, truong thanh
hoc thieu » toc thieu, hoc hien
trung cua » truong cua, trung cap, dung cua
tran tuan » tran xuan, tran quang, tran thanh
dung cong » dung trong
cong tan » cong tac, cong san, cong thanh
tan van » tran van, tang van, luan van

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - hanh ((((trung cua) OR (trung tuan))) OR (tran tuan)) dung cong tan van ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sach - hanh ((((trung cua) OR (trung tuan))) or (tran tuan)) dung cong tan van ban~".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - hanh ((((trung cua) OR (trung tuan))) or (tran tuan)) dung cong tan van ban*.