Perhaps you should try some spelling variations:
khoa hoi » khoan hoi, khoa hoc, khoa doi
van hanh » van thanh, ban hanh, van anh
hanh vai » hanh vi, hanh va, hanh tai
tu tieng » luc tieng, tu tuong, tu trong
te sach » toc sach
hoa hoi » hoa hoc, hoa doi, hoc hoi
thu van » thuc van, thuy van, tu van
y lang » o lang, _ lang, tay lang
le nam » ly nam, le na, te nam
he nam » ha nam, nghe nam
vai tu » tai tu, mai tu, cai 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 y lang ((hoa hoi) or (khoa hoi)). hieu ((le nam) or (he nam)) thu van hanh vai tu tieng~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y lang ((hoa hoi) OR (khoa hoi)). hieu ((le nam) OR (he nam)) thu van hanh vai tu tieng.
• Adding a wildcard symbol may retrieve word variants: te sach y lang ((hoa hoi) or (khoa hoi)). hieu ((le nam) or (he nam)) thu van hanh vai tu tieng*.