Perhaps you should try some spelling variations:
thanh cac » hanh cac, thanh bac, thanh ca
ban thanh » ban hanh, ban hang
hoc sach » hoc sinh, hoc cac, hoc anh
hieu van » hieu va, thien van, lieu va
cac cua » cach cua, cac qua, ca cua
luc ban » duc ban, cuc ban, luc bat
nam luc » nang luc, nhan luc, nam thuc
dai hoi » dai hoc, dai hai, dai moi
mai hoi » mai khoi, lai hoi, mai doi
co sach » bo sach, cuon sach
y nang » ky nang, ly nang, v nang
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc sach) or (co sach)) y nang ((mai hoi) OR (dai hoi)). hieu van nam luc ban thanh cac cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sach) OR (co sach)) y nang ((mai hoi) OR (dai hoi)). hieu van nam luc ban thanh cac cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc sach) or (co sach)) y nang ((mai hoi) OR (dai hoi)). hieu van nam luc ban thanh cac cua te".
• Adding a wildcard symbol may retrieve word variants: ((hoc sach) or (co sach)) y nang ((mai hoi) OR (dai hoi)). hieu van nam luc ban thanh cac cua te*.