Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
ban thanh » ban hanh, ban hang
chat hoc » chat hoa, chat thom, cho hoc
cham duc » pham duc, cham soc, pham duy
qua cham » qua hai, qua cac, va cham
vai cua » dai cua, hai cua, lai cua
duc ban » duc tan, duc van, dua ban
vu sach » vu bach, su sach, vu khach
cao hoi » cau hoi, co hoi, cao hoc
ty nang » ky nang, ty xang, ty hang
so sach » so sanh, bo sach, co sach
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: ((vu sach) or (so sach)) ty nang ((cao hoi) or (chat hoc)). hieu qua cham duc ban thanh vai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (so sach)) ty nang ((cao hoi) OR (chat hoc)). hieu qua cham duc ban thanh vai cua tu.
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (so sach)) ty nang ((cao hoi) or (chat hoc)). hieu qua cham duc ban thanh vai cua tu*.