Perhaps you should try some spelling variations:
thu sac » thu sach, thu san, thu xac
nang ma » tang ma, sang ma, nang cao
van cac » van cau, van bac, dan cac
van hac » van hoc, van ha, van hai
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
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 cac) or (van hac)) dat ((va hanh) or (va danh)) vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sac ky nang ma hoi. hieu ((van cac) OR (van hac)) dat ((va hanh) OR (va danh)) vi cua vat.
• Adding a wildcard symbol may retrieve word variants: thu sac ky nang ma hoi. hieu ((van cac) or (van hac)) dat ((va hanh) or (va danh)) vi cua vat*.