Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam tu
tu cach » tu cac
ky sang » ky nang, ky dang, ky tang
sang ma » tang ma, nang ma, sang tao
xa hanh » xa thanh, xa khanh, va hanh
ma hoi » mai hoi, xa hoi, ma hoa
vi cua » vai cua, di cua
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 cach) or (thu sach)) ky sang ma hoi. hieu van ((nam thuc) or (nam thu)) xa hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (thu sach)) ky sang ma hoi. hieu van ((nam thuc) OR (nam thu)) xa hanh vi cua te.
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (thu sach)) ky sang ma hoi. hieu van ((nam thuc) or (nam thu)) xa hanh vi cua te*.