Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
van dang » van dong, van dung, van nang
nang xay » dang xay, nganh xay, nang xuan
cham tuc » nham thuc, pham thuc, tham thuc
va dang » va nang, va lang, da dang
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
xay hoi » xa hoi, tay hoi, cay phoi
te sach » toc sach
va viet » hoa viet, san viet, mai viet
hai va » hai van, thai va, hoi va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) or (te sach)) ky nang xay hoi. hieu ve cham tuc ((va dang) OR (van dang)) hai va viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (te sach)) ky nang xay hoi. hieu ve cham tuc ((va dang) OR (van dang)) hai va viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (te sach)) ky nang xay hoi. hieu ve cham tuc ((va dang) OR (van dang)) hai va viet".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (te sach)) ky nang xay hoi. hieu ve cham tuc ((va dang) OR (van dang)) hai va viet*.