Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hieu van » hieu va, thien van, lieu va
nam duoc » nam thuoc, da duoc, dat duoc
mai dinh » mai dich, tai dinh, mai minh
sach ky » sac ky, sach y, sach ty
ma tinh » may tinh, man tinh, mai tinh
la tren » loai tren, dua tren, dat tren
ma hoi » mai hoi, xa hoi, me hoi
da la » da lam, da lat, de la

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 ky nang ((ma hoi) OR (ma hoa)). hieu van nam duoc ((ma tinh) or (mai dinh)) da la tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky nang ((ma hoi) OR (ma hoa)). hieu van nam duoc ((ma tinh) OR (mai dinh)) da la tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ky nang ((ma hoi) OR (ma hoa)). hieu van nam duoc ((ma tinh) or (mai dinh)) da la tren".
• Adding a wildcard symbol may retrieve word variants: thuat sach ky nang ((ma hoi) OR (ma hoa)). hieu van nam duoc ((ma tinh) or (mai dinh)) da la tren*.