Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
hieu van » hieu va, thien van, lieu va
cuu tre » cua tre, cau tren, cau treo
vai cuu » vai cua
van cac » van hac, van cau, van bac
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
tac va » tac da, tac xa, tac ha
tuc va » thuc va, truc va, tuc xa
su cao » cu cao, vu cao, su co
su sac » su sach, su cac, su xac

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sac) or (su cao)) ky nang ma hoi. hieu van cac ((tac va) OR (tuc va)) thanh vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sac) OR (su cao)) ky nang ma hoi. hieu van cac ((tac va) OR (tuc va)) thanh vai cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sac) or (su cao)) ky nang ma hoi. hieu van cac ((tac va) OR (tuc va)) thanh vai cuu tre*".