Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hanh lai » hanh lam, hanh tai, thanh lap
tu sach » thu sach, su sach, te sach
ky sang » ky nang, ky dang, duy sang
ky tang » ky nang, ky dang, kho tang
hieu ve » hieu va, hieu van
xuc van » duc van, luc van, xuc ban
cua tre » cuu tre, cua triet, dua tren
ve cam » ve cham, ve cac, va cam
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 sach ((ky sang) or (ky tang)) xa hoi. hieu ve cam xuc van hanh lai ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky sang) OR (ky tang)) xa hoi. hieu ve cam xuc van hanh lai ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ky sang) or (ky tang)) xa hoi. hieu ve cam xuc van hanh lai ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky sang) or (ky tang)) xa hoi. hieu ve cam xuc van hanh lai ((cua tre) OR (cua te))*.