Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
van hanh » van thanh, ban hanh, van anh
cham duc » pham duc, cham soc, pham duy
tu sach » thu sach, su sach, te sach
hanh di » hanh vi, hanh de, hang di
duc van » duc va, duc tan, duc manh
va cham » va chat, va tham
su tien » su kien, su hien, tu tieng
di su » doi su, ki su, da su
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thuat sach)) ky nang ((5 hoi) or (o hoi)). lieu va cham duc van hanh di su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuat sach)) ky nang ((5 hoi) OR (o hoi)). lieu va cham duc van hanh di su tien.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuat sach)) ky nang ((5 hoi) or (o hoi)). lieu va cham duc van hanh di su tien*.