Perhaps you should try some spelling variations:
may trinh » may tinh, lap trinh, quy trinh
hieu van » hieu va, thien van, lieu va
trinh vi » trinh va, trinh ve, trinh viet
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
cac tuc » cac tu, cac tac, cac nuoc
cac toc » cac toi, cac nuoc, cac thoi
cuu tre » cua tre, cau tren, cau treo
vi cuu » vi luu, vinh cuu

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 ky tang xa hoi. hieu van ((cac tuc) or (cac toc)) may trinh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky tang xa hoi. hieu van ((cac tuc) OR (cac toc)) may trinh vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: vu sach ky tang xa hoi. hieu van ((cac tuc) or (cac toc)) may trinh vi cuu tre*.