Perhaps you should try some spelling variations:
cam truc » cau truc, nam truc, lam truoc
hanh tai » thanh tai, hang tai, han tai
tu sach » thu sach, su sach, te sach
sach lo » sach dao, sach doi, sach hoi
hanh va » hang va, hanh vi
truc va » thuc va, thuc vat, trung va
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
nang xa » lang xa, nang ma, mang xa
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 lo ((nang xa) OR (nang x)) hoi. hieu ve cam truc va ((hanh tai) or (hanh va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach lo ((nang xa) OR (nang x)) hoi. hieu ve cam truc va ((hanh tai) OR (hanh va)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach lo ((nang xa) OR (nang x)) hoi. hieu ve cam truc va ((hanh tai) or (hanh va)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach lo ((nang xa) OR (nang x)) hoi. hieu ve cam truc va ((hanh tai) or (hanh va)) cua tre*.