Perhaps you should try some spelling variations:
manh hanh » xanh hanh, danh thanh, minh thanh
sach che » sach thue, sach nha, sach cap
che nang » cho nang, chuc nang, chua nang
hanh tai » thanh tai, hang tai, han tai
duc manh » suc manh, duc anh, duc minh
tai cua » thai cua, tai cuc, tri cua
cam duc » cam xuc, cao duc, pham duc
hieu ve » hieu va, hieu van
te sach » toc sach
dai moi » doi moi, dai hoi
mai hoi » mai khoi, dai hoi, lai hoi
ve cam » ve cham, ve cac, va cam
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach che nang ((xa hoi) or (((mai hoi) or (dai moi)))). hieu ve cam duc manh hanh tai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach che nang ((xa hoi) OR (((mai hoi) OR (dai moi)))). hieu ve cam duc manh hanh tai cua tu.
• Adding a wildcard symbol may retrieve word variants: te sach che nang ((xa hoi) or (((mai hoi) or (dai moi)))). hieu ve cam duc manh hanh tai cua tu*.