Perhaps you should try some spelling variations:
thanh vien » nhan vien, thanh van
vien cua » viec cua, dien cua, tien cua
su sach » so sach, vu sach
duc man » duc manh, duc mau, duc van
cua tre » cua te, cuu tre, cua triet
sach ly » sach y, sach lo, sach ty
hieu va » lieu va
sang ma » tang ma, nang ma, sang tao
ly sang » ly hang, ly san, ly vang
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ly sang ma hoi. ((hieu va) OR (hieu qua)) cham ((duc man) or (duc tan)) thanh vien cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ly sang ma hoi. ((hieu va) OR (hieu qua)) cham ((duc man) OR (duc tan)) thanh vien cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ly sang ma hoi. ((hieu va) OR (hieu qua)) cham ((duc man) or (duc tan)) thanh vien cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ly sang ma hoi. ((hieu va) OR (hieu qua)) cham ((duc man) or (duc tan)) thanh vien cua tre*.