Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
ban thanh » ban hanh, ban hang
te sach » toc sach
sach ty » sach y, sach tu, sach thu
cuc ban » cua ban, cac ban, cuu ban
cam cuc » cam xuc, cham cuu, pham cuc
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
nang xa » nang x, mang xa, ang xa
nang ma » tang ma, sang ma, nang cao
va cam » va cham, va cac, va cao
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ty ((((nang xa) OR (nang ma))) or (lang xa)) hoi. hieu va cam cuc ban thanh dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty ((((nang xa) OR (nang ma))) OR (lang xa)) hoi. hieu va cam cuc ban thanh dai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty ((((nang xa) OR (nang ma))) or (lang xa)) hoi. hieu va cam cuc ban thanh dai cua te".
• Adding a wildcard symbol may retrieve word variants: te sach ty ((((nang xa) OR (nang ma))) or (lang xa)) hoi. hieu va cam cuc ban thanh dai cua te*.