Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
ban thanh » ban hanh, ban hang
nang cho » nang chon, ngang cho, nang cao
cam chan » cam nhan, dan chan
cam cac » ca cac, nam cac
cuc tre » duc tre, cua tre, cuu tre
sach tu » sach thu, cach tu, sach ty
hieu ve » hieu va, hieu van
cho hoc » co hoc, khoa hoc

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 tu) or (sach y)) nang cho hoc. hieu ve ((cam cac) OR (cam chan)) ban thanh tai cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach tu) OR (sach y)) nang cho hoc. hieu ve ((cam cac) OR (cam chan)) ban thanh tai cuc tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach tu) or (sach y)) nang cho hoc. hieu ve ((cam cac) OR (cam chan)) ban thanh tai cuc tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach tu) or (sach y)) nang cho hoc. hieu ve ((cam cac) OR (cam chan)) ban thanh tai cuc tre*.