Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
thu sach » thuat sach, thuoc sach, thu hoach
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam tu
ha thanh » va thanh, pham thanh, phan thanh
tu sach » su sach, te sach, tu cach
ky sang » ky nang, ky dang, ky tang
sang ma » tang ma, nang ma, sang tao
vai cua » dai cua, hai cua, lai cua
ma hoi » mai hoi, xa hoi, ma hoa
cua te » cua tu

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 (thu sach)) ky sang ma hoi. hieu van ((nam thuc) or (nam thu)) ha thanh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky sang ma hoi. hieu van ((nam thuc) OR (nam thu)) ha thanh vai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) ky sang ma hoi. hieu van ((nam thuc) or (nam thu)) ha thanh vai cua te".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) ky sang ma hoi. hieu van ((nam thuc) or (nam thu)) ha thanh vai cua te*.