Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van ban
van cam » van nam, van lam, van cau
van anh » van thanh, tuan anh, van minh
cam tuc » cam xuc, cam tu, nam thuc
tu sach » thu sach, su sach, te sach
sang ma » tang ma, nang ma, sang tao
ky sang » ky nang, ky dang, ky tang
vai hoa » van hoa, va hoa, dai hoa
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: ((tu sach) or (thuat sach)) ky sang ma hoi. hieu van cam tuc ((van hanh) OR (van anh)) vai hoa viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuat sach)) ky sang ma hoi. hieu van cam tuc ((van hanh) OR (van anh)) vai hoa viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thuat sach)) ky sang ma hoi. hieu van cam tuc ((van hanh) OR (van anh)) vai hoa viet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuat sach)) ky sang ma hoi. hieu van cam tuc ((van hanh) OR (van anh)) vai hoa viet*.