Perhaps you should try some spelling variations:
cam thuc » am thuc, nam thuc, cam thu
hanh vai » hanh vi, hanh tai, hanh van
thi nang » thi cong, ki nang, thi hanh
tu sach » thu sach, te sach, tu cach
hanh va » hang va, hanh vi
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
su sach » so sach, vu sach
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) OR (su sach)) thi nang xa hoi. hieu ve cam thuc va ((hanh vai) or (hanh va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) thi nang xa hoi. hieu ve cam thuc va ((hanh vai) OR (hanh va)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) thi nang xa hoi. hieu ve cam thuc va ((hanh vai) or (hanh va)) cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) thi nang xa hoi. hieu ve cam thuc va ((hanh vai) or (hanh va)) cua tre*.