Perhaps you should try some spelling variations:
thuat lanh » thuat lap, thuat san
duc tuan » duc thuan, duc tan, duc toan
cua tre » cuu tre, cua triet, dua tren
dao duc » giao duc, tao duoc
hieu ve » hieu va, hieu van
ma hoi » mai hoi, xa hoi, ma hoa
7 tang » 6 tang
ve dao » de dao, va dao, ve bao
anh ve » hanh ve, anh va, anh viet
y tang » ky tang, 6 tang, 5 tang
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: thuat lanh ((y tang) OR (7 tang)) ma hoi. hieu ve dao duc tuan anh ve ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat lanh ((y tang) OR (7 tang)) ma hoi. hieu ve dao duc tuan anh ve ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat lanh ((y tang) OR (7 tang)) ma hoi. hieu ve dao duc tuan anh ve ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: thuat lanh ((y tang) OR (7 tang)) ma hoi. hieu ve dao duc tuan anh ve ((cua tre) or (cua te))*.