Perhaps you should try some spelling variations:
khanh vang » khanh van, khach hang, thanh van
nuoc sach » nguoi sach, hoc sach, cuoc cach
hieu van » hieu va, thien van, lieu va
vang cua » mang cua, hang cua, tang cua
cua viet » ca viet, hoa viet, cua vat
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
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 (nuoc sach)) ky nang ma hoi. hieu van nam ((tu van) OR (tu va)) khanh vang cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (nuoc sach)) ky nang ma hoi. hieu van nam ((tu van) OR (tu va)) khanh vang cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (nuoc sach)) ky nang ma hoi. hieu van nam ((tu van) OR (tu va)) khanh vang cua viet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (nuoc sach)) ky nang ma hoi. hieu van nam ((tu van) OR (tu va)) khanh vang cua viet*.