Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
vanh tai » van tai, hanh tai, anh tai
tu sach » thu sach, su sach, te sach
so sach » so sanh, bo sach, co sach
ty nang » ky nang, ty xang, ty hang
nang ma » tang ma, sang ma, nang cao
van cau » van dau, van hau, van chat
cau tuc » cau truc, cau tu, cau luc
xa vanh » xa vinh, xa van, xa thanh
ma hoi » mai hoi, xa hoi, ma hoa
tai va » thai va, mai va, tri va
thiet » thieu

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 (so sach)) ty nang ma hoi. hieu van cau tuc xa vanh tai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (so sach)) ty nang ma hoi. hieu van cau tuc xa vanh tai va thiet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (so sach)) ty nang ma hoi. hieu van cau tuc xa vanh tai va thiet*.