Perhaps you should try some spelling variations:
hanh trung » thanh trung, hanh trang, manh trung
doi chieu » doi chi, ho chieu, mot chieu
nam thang » nam thanh, nam trong, nam trung
pham hang » pham hoang, pham hong, pham hanh
doc hieu » toc thieu, hoc thieu, hoc hien
cong tac » cong ty
tac tran » tan tran, tac trai, tac tren
tran tan » tran tuan, tran van, tran thanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doi chieu) OR (doc hieu)) sach - hanh trung ((nam thang) or (pham hang)) cong tac tran tan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (doc hieu)) sach - hanh trung ((nam thang) OR (pham hang)) cong tac tran tan.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) OR (doc hieu)) sach - hanh trung ((nam thang) or (pham hang)) cong tac tran tan".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) OR (doc hieu)) sach - hanh trung ((nam thang) or (pham hang)) cong tac tran tan*.