Perhaps you should try some spelling variations:
dam thanh » dao thanh, nam thanh, am thanh
da thanh » dao thanh, dat thanh, dan thanh
hieu van » hieu va, thien van, lieu va
cuu tre » cua tre, cau tren, cau treo
cau tac » cau thac, cau tao, cuu tac
vai cuu » vai cua
van cau » van dau, van hau, van chat
tang ma » mang may, tang van
ky tang » ky nang, ky dang, kho tang
ma hoi » mai hoi, xa hoi, ma hoa
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 tang ma hoi. hieu van cau tac ((da thanh) OR (dam thanh)) vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sac) OR (su cao)) ky tang ma hoi. hieu van cau tac ((da thanh) OR (dam thanh)) vai cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sac) or (su cao)) ky tang ma hoi. hieu van cau tac ((da thanh) OR (dam thanh)) vai cuu tre*".