Perhaps you should try some spelling variations:
cham tuc » nham thuc, pham thuc, tham thuc
va doanh » van doanh, vay doanh, va danh
tu sach » thu sach, su sach, te sach
va nang » van nang, da nang, cam nang
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
cuc tre » cua tre, cuu tre, cuc thue
duc tre » duoc tren, duc tien
v nang » vu nang, van nang, voi nang
tuc va » thuc va, truc va, tuc xa

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 ((v nang) or (va nang)) xa hoi. hieu ve cham tuc va doanh tai ((cuc tre) OR (duc tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((v nang) OR (va nang)) xa hoi. hieu ve cham tuc va doanh tai ((cuc tre) OR (duc tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((v nang) or (va nang)) xa hoi. hieu ve cham tuc va doanh tai ((cuc tre) OR (duc tre))".
• Adding a wildcard symbol may retrieve word variants: tu sach ((v nang) or (va nang)) xa hoi. hieu ve cham tuc va doanh tai ((cuc tre) OR (duc tre))*.