Perhaps you should try some spelling variations:
hieu quan » lieu quan, thien quan, lien quan
thu sach » tu sach, thuat sach, thuoc sach
sach dao » lanh dao
danh vai » danh sai, danh va, doanh van
dao van » do van, dang van
xay hoi » xa hoi, tay hoi, cay phoi
cau duc » cao duc, cau luc, chu duc
va danh » va dinh, va dan, va hanh
vai cua » dai cua, hai cua, lai cua
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: thu sach dao van xay hoi. ((hieu quan) or (hieu qua)) cau duc va danh vai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach dao van xay hoi. ((hieu quan) OR (hieu qua)) cau duc va danh vai cua tu.
• Adding a wildcard symbol may retrieve word variants: thu sach dao van xay hoi. ((hieu quan) or (hieu qua)) cau duc va danh vai cua tu*.