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