Perhaps you should try some spelling variations:
ban thanh » ban hang
hieu van » hieu va, thien van, lieu va
ban hanh » ban hang
thu sac » thu sach, thu san, thu xac
nang ma » tang ma, sang ma, nang cao
van hac » van hoc, van ha, van hai
hac dat » hoc dat, tac dat, hoach dat
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, ma hoa
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sac ky nang ma hoi. hieu van hac dat ((le thanh) or (((ban thanh) or (ban hanh)))) vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sac ky nang ma hoi. hieu van hac dat ((le thanh) OR (((ban thanh) OR (ban hanh)))) vi cua vat.
• Adding a wildcard symbol may retrieve word variants: thu sac ky nang ma hoi. hieu van hac dat ((le thanh) or (((ban thanh) or (ban hanh)))) vi cua vat*.