Perhaps you should try some spelling variations:
thuat san » thuat toan, thuat song, thuat lanh
hoc sach » hoc sinh, hoc cac, hoc anh
van hanh » van thanh, ban hanh, van anh
luu tre » luu tru, luy tre
xuc van » duc van, luc van, vuc van
cac xuc » cam xuc, cac nuoc, chat xuc
qua cac » cua cac
sang ma » tang ma, nang ma, sang tao
ky sang » ky nang, ky dang, ky tang
cuu tre » cua tre, cau tren, cau treo
ma hoi » mai hoi, xa hoi, ma hoa

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

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