Perhaps you should try some spelling variations:
sach kha » sach nha, sach ha, sach tham
kha nang » phap nang, ky nang, ki nang
cam thuc » am thuc, nam thuc, cam thu
hang vai » hang tai, hang hai, hang vi
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam

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 kha nang xa hoi. hieu ve cam thuc va ((hang vai) or (hang va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach kha nang xa hoi. hieu ve cam thuc va ((hang vai) OR (hang va)) cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach kha nang xa hoi. hieu ve cam thuc va ((hang vai) or (hang va)) cua tre*.