Perhaps you should try some spelling variations:
thuat sach » thuat lanh
thuat san » thuat toan, thuat song, thuat lanh
van hanh » van thanh, ban hanh, van anh
ky sang » ky nang, ky dang, ky tang
sang ma » tang ma, nang ma, sang tao
hieu va » lieu va, hieu qua
cac dai » cac dan, cac bai, can dai
ma hoi » mai hoi, xa hoi, ma hoa
vi cua » vai cua, di cua

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) or (thuat san)) ky sang ma hoi. hieu va ((cac dai) or (cai dat)) van hanh vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuat sach) OR (thuat san)) ky sang ma hoi. hieu va ((cac dai) OR (cai dat)) van hanh vi cua vat.
• Adding a wildcard symbol may retrieve word variants: ((thuat sach) or (thuat san)) ky sang ma hoi. hieu va ((cac dai) or (cai dat)) van hanh vi cua vat*.