Perhaps you should try some spelling variations:
quan tai » quan tri, quang tri, quan li
van quan » van ban
su sach » so sach, vu sach
tai cua » thai cua, tai cuc, tri cua
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
cao vu » cao su, cao va, cao tu
vu van » tu van

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty ((nang ma) or (nang x)) hoi. ((hieu qua) or (lieu va)) cao vu van quan tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((nang ma) OR (nang x)) hoi. ((hieu qua) OR (lieu va)) cao vu van quan tai cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ty ((nang ma) or (nang x)) hoi. ((hieu qua) or (lieu va)) cao vu van quan tai cua tre*.