Perhaps you should try some spelling variations:
thanh tai » thanh toan, doanh tai, thanh san
thanh hai » thanh phan, thanh hoa, thanh san
nang cho » nang chon, ngang cho, nang cao
cac ban » cac dan, cac van, can ban
cuc tre » duc tre, cua tre, cuu tre
cam cac » ca cac, nam cac, cam chan
sach ky » sac ky, sach ty, sach kem
hieu ve » hieu va, hieu van
cho hoc » co hoc, khoa hoc
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 ky) or (sach y)) nang cho hoc. hieu ve cam cac ban ((thanh tai) OR (thanh hai)) cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach y)) nang cho hoc. hieu ve cam cac ban ((thanh tai) OR (thanh hai)) cuc tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sach y)) nang cho hoc. hieu ve cam cac ban ((thanh tai) OR (thanh hai)) cuc tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach y)) nang cho hoc. hieu ve cam cac ban ((thanh tai) OR (thanh hai)) cuc tre*.