Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van chat » cao chat
chat xuc » chat huu, cam xuc, chao xu
cuu tre » cua tre, cau tren, cau treo
dan vai » dan va, dan tai, dan vat
xuc cac » xuc tac, tuc cac, xuc cam
su sach » so sach
nang ma » tang ma, sang ma, nang cao
vu sach » vu bach, vu khach
ma hoi » mai hoi, xa hoi, ma hoa
cua su » qua su

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) OR (vu sach)) ky nang ma hoi. hieu van chat xuc cac dan vai ((cuu tre) or (cua su))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ky nang ma hoi. hieu van chat xuc cac dan vai ((cuu tre) OR (cua su)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (vu sach)) ky nang ma hoi. hieu van chat xuc cac dan vai ((cuu tre) or (cua su))".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (vu sach)) ky nang ma hoi. hieu van chat xuc cac dan vai ((cuu tre) or (cua su))*.