Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
thu sac » thu sach, thu san, thu xac
hanh va » hang va, hanh vi
cua tre » cuu tre, cua triet, dua tren
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, me hoi
va nam » van nam, ha nam, va nay
nam lo » nam bo, nam so, nam co
lo van » le van, vo van, so van
cua te » cua tu

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) or (ma hoa)). lieu va nam lo van hanh va ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sac ky nang ((ma hoi) OR (ma hoa)). lieu va nam lo van hanh va ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sac ky nang ((ma hoi) or (ma hoa)). lieu va nam lo van hanh va ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: thu sac ky nang ((ma hoi) or (ma hoa)). lieu va nam lo van hanh va ((cua tre) OR (cua te))*.