Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
dan vai » dan tai, dan vat, den vai
hieu ve » hieu va, hieu van
cam tuc » cam xuc, cam tu, nam thuc
ky dang » ky nang, ky danh
ky lang » ky nang, ky tang, tay lang
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam
tuc va » thuc va, truc va, tuc xa
dan va » doan va, dan ca, ban va

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 lang) or (ky dang)) xa hoi. hieu ve cam tuc va ((dan vai) OR (dan va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky lang) OR (ky dang)) xa hoi. hieu ve cam tuc va ((dan vai) OR (dan va)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ky lang) or (ky dang)) xa hoi. hieu ve cam tuc va ((dan vai) OR (dan va)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky lang) or (ky dang)) xa hoi. hieu ve cam tuc va ((dan vai) OR (dan va)) cua tre*.