Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
dung doi » huong doi, dung tai, dung co
hieu su » hieu sau, tieu su, hieu so
su cham » su pham, tu cham, vu cham
doi cua » dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
luc va » tuc va, loc va
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu hoach) or (thuat sach)) ky nang x hoi. hieu su cham ((duc va) or (luc va)) dung doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu hoach) OR (thuat sach)) ky nang x hoi. hieu su cham ((duc va) OR (luc va)) dung doi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((thu hoach) or (thuat sach)) ky nang x hoi. hieu su cham ((duc va) or (luc va)) dung doi cua tre*.