Perhaps you should try some spelling variations:
thuat san » thuat toan, thuat song, thuat lanh
toc sach » hoc sach, doc sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
chat xuc » chat huu, cam xuc, chao xu
cac xuc » cam xuc, cac nuoc, cac cuoc
sang ma » tang ma, nang ma, sang tao
ky sang » ky nang, ky dang, ky tang
luu tre » luu tru, cuu tre, luy tre
ma hoi » mai hoi, xa hoi, ma hoa
vi luu » vi lua

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

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