Perhaps you should try some spelling variations:
te sach » toc sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
long ha » dong ha, cong ha, dong hoa
qua cac » cua cac
cac hoc » cach hoc, cac hop, bac hoc
hoc van » hoc dan, hoc va, hoc vat
van anh » van thanh, tuan anh, van minh
anh dai » vanh dai, anh bai, anh dat
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 ky ((((nang xa) or (nang ma))) or (long ha)) hoi. hieu qua cac hoc van anh dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((((nang xa) OR (nang ma))) OR (long ha)) hoi. hieu qua cac hoc van anh dai cua te.
• Adding a wildcard symbol may retrieve word variants: te sach ky ((((nang xa) or (nang ma))) or (long ha)) hoi. hieu qua cac hoc van anh dai cua te*.