Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hieu ve » hieu va, hieu van
cac cuu » cap cuu, cac cau, cac chu
sang ma » tang ma, nang ma, sang tao
hanh va » hang va
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
ma hoi » mai hoi, xa hoi, ma hoa
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach _ sang ma hoi. hieu ve cac cuu van ((hanh va) or (hanh vi)) ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach _ sang ma hoi. hieu ve cac cuu van ((hanh va) OR (hanh vi)) ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach _ sang ma hoi. hieu ve cac cuu van ((hanh va) or (hanh vi)) ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: thuat sach _ sang ma hoi. hieu ve cac cuu van ((hanh va) or (hanh vi)) ((cua tre) OR (cuu tre))*.