Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thu sach » tu sach, thuoc sach, thu hoach
van hanh » van thanh, ban hanh, van anh
cham duc » pham duc, cham soc, pham duy
su triet » su viet, su tien, ve triet
va cham » va chat, va tham
duc van » duc va, duc tan, duc manh
hanh di » hanh vi, hanh de, hang di
x hoi » xa hoi, x ho, 5 hoi
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: ((thu sach) OR (thuat sach)) ky nang ((x hoi) or (o hoi)). lieu va cham duc van hanh di su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuat sach)) ky nang ((x hoi) OR (o hoi)). lieu va cham duc van hanh di su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (thuat sach)) ky nang ((x hoi) or (o hoi)). lieu va cham duc van hanh di su triet".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) OR (thuat sach)) ky nang ((x hoi) or (o hoi)). lieu va cham duc van hanh di su triet*.