Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
toc sach » hoc sach, doc sach, thuoc sach
van hang » van khang, van hoang, van thang
cham tuc » pham thuc, tham thuc, cham soc
sach tu » sach thu, cach tu, sach ty
hang vi » hang va, hanh vi, hang di
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach tu ((nang xa) OR (lang xa)) hoi. hieu va ((cham tuc) or (nham thuc)) van hang vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach tu ((nang xa) OR (lang xa)) hoi. hieu va ((cham tuc) OR (nham thuc)) van hang vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach tu ((nang xa) OR (lang xa)) hoi. hieu va ((cham tuc) or (nham thuc)) van hang vi cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach tu ((nang xa) OR (lang xa)) hoi. hieu va ((cham tuc) or (nham thuc)) van hang vi cua tre*.